Abstract

The effect of a novel treatment principle for bacterial vaginosis has been investigated in an open clinical study. 10 patients received a single dose while 20 patients received three applications every third day. The formulation is in the form of vaginal foam, containing lactic acid, hydrogen peroxide and an antimicrobial lipid. The intention of using the foam form for delivery is to avoid the creation of untreated areas, as is the case for other local formulations. Clinical signs, symptom and microbial effects have been studied using strict Amsel criteria and modified Hay/Ison for inclusion and modified Hay/Ison to monitor clinical efficacy pre- and post- menstruation. Therapeutic parameters as pH, malodor, abnormal discharge, itch and pain were monitored during the study. The microbiological was monitored by PCR being able to detect 6 pathogens and Lactobacilli.

Results: The microbiological results in both groups indicate that all pathogens are reduced by the treatment while the number of Lactobacilli increases. The therapeutic parameters, pH, malodor and abnormal discharge are instantly improved with lasting effects. The clinical and therapeutic parameters follow the microbial events. All patients experience improvement of symptoms and after a single dose 10% had the grade “normal” according to Hay/Ison after post-treatment menstruation. The corresponding Figure for three administrations was 30%. The clinical effect of three administrations was similar to 5 days of daily treatments using antimicrobial agents such as metronidazole administered the vaginal route but with superior symptoms relief. No adverse effects related to treatment were registered.

Conclusion: The product had a rapid effect on Hay/Ison grade and produced long-lasting improvements in symptoms, even in patients with relapse of BV. We believe that the results are promising and merit further development to improve treatment of BV and STI.

Introduction

Bacterial vaginosis (BV) is an infection in which the Lactobacilli that normally populate the vagina are replaced by anaerobic bacteria. Data from the NHANES (National Health and Nutrition Examination Survey) 2001-2004 estimated a 29% of patient aged 14 to 49 and more than 50% of African American women were positive to BV based on Nugent criteria [1]. Nonetheless, BV increases the risks of various sexually transmitted infections (STIs), including chlamydia, gonorrhoea and human immunodeficiency virus (HIV) [2-5]. The symptoms of BV including abnormal discharge and malodour expressed as fishy odour which are socially unacceptable and disturbing for the affected women. Moreover, in pregnant women it has been linked to negative outcomes such as preterm birth and miscarriage. [6-8].

The etiology of BV is not fully understood but detailed information of the microbiological state of healthy and infected women has been generated. Composition of the vaginal microbiota in healthy, intermediary and infected women has been described by Shipitsyna and Roos et.al. [9] using quantitative PCR analysis. The relation of 85% Lactobacilli and 15% pathogens, G.vaginalis and A vaginae, in healthy women was reversed to 15 % Lactobacilli and 85 % pathogens in infected women. In an intermediary group, a 50/50 relation was found.

The current treatment of BV includes antibiotics, such as clindamycin, and metronidazole/tinidazole, high recurrence if evaluation is done post menstruation. Extended antimicrobial treatment of bacterial vaginosis combined with human Lactobacilli to find the best treatment and minimize the risk of relapses has also been tested. Newly published studies monitoring recurrence using more stringent criteria to define “cured” show a post- menstruation cure rate of less than 30% for vaginal metronidazole [10-12].

Non-antibiotic treatment for BV includes lactic acid, locally applied gels and probiotic Lactobacilli with cure rates that in general are very poor. Dequalinium chlorid in the form of vaginal tables may seem as a better alternative [13] the search for new non-antibiotic candidates illustrates the interest for use other antiseptic and non-antibiotic compounds.

In the present study clinical signs and symptoms and the vaginal flora in patients with bacterial vaginosis using a new product based on a novel approach to local vaginal treatment was investigated in an open-label, single-arm study.

This is a first in man study of this product and our objective has been to study the safety and efficacy of the novel product after a single and a triple dose in women suffering from BV.

The primary objective was to study the effect of hydrogen peroxide with lactic acid in foam to treat BV and the secondary objective was to study the safety of the product used as a singleand multiple-dose vaginal application.

Materials and Methods

Since the product contain hydrogen peroxide and lactic acid it has a potential for being effective in other diseases as well, such as STI, sexually transmitted infections. The decision to make the first study on bacterial vaginosis is due to the welldeveloped diagnosis for both clinical and microbiological parameters and there is a good understanding on the conditions in healthy and diseased women.

The novel approach based on two known factors regulating the microbiological balance in the vagina, hydrogen peroxide (3 mg/g) and lactic acid (27 mg/g) both generated by Lactobacilli. The product is presented as vaginal foam and a third compound, a lipid, 1-Glycerol monolaurate, has been added in crystalline form to enhance the foam properties.

Most local applied products are gels, creams or vaginal suppositories and these formulations limit the distribution of the drug. The foam is sprayed though an actuator for vaginal application and fills the entire vaginal cavity and melts just below body temperature providing coverage of the entire vaginal mucus. The product has been tested for antimicrobial effect in vitro demonstrating powerful antimicrobial capacity. In an “In vitro” study the antimicrobial effect on 2 pathogens, G. vaginalis and N. gonorrhea has been investigated. These species both have the ability to produce catalases, a hydrogen peroxide degrading enzyme. The results indicate that a dilution of 1:1000 of the novel product, containing 0.3% hydrogen peroxide, is inhibiting growth of Neisseria gonorrhoea ATCC 19424 on Mueller-Hinton agar without sheep blood. With sheep blood the minimum inhibiting concentration is 1:100. The results indicate that the novel product can eradicate bacteria independent of the presence of catalases (report on file).

30 patients, age 18 to 49 years with bacterial vaginosis were recruited from the gynecological department at Skaraborg Hospital Skövde. 10 patients were treated by a single dose and 20 by three doses. The first dose was done at the hospital by health care professionals while dose 2 and 3 were administered by the patient at home.

The inclusion criteria were age ≥ 18 years, regular menstruation cycle, using adequate contraceptive measures and bacterial vaginosis, as defined by fulfilment of at least 3 of the following criteria (Amsel criteria):

a) pH of vaginal fluid >4.5

b) Positive amine test

c) Presence of clue cells

d) Presence of characteristic, homogenous vaginal discharge

The primary efficacy parameters are results generated by modified Hay/Ison method using rehydrated airdried vaginal smears, the grades are as follows: (1) “Normal” – Lactobacilli predominate; (2) “Intermediate” – Mixed flora with Lactobacilli and Gardnerella/Mobiluncus spp. present; and (3) “Bacterial vaginosis” – Predominantly Gardnerella and/or Mobiluncus spp, with few or no Lactobacilli.

Exploratory efficacy variables were patient-reported symptoms of itch, pain, malodour and vaginal discharge, pH of the vaginal fluid, quantitation of pathogens in relation to Lactobacilli. The quantification of the vaginal flora are done by PCR technique, in the form of a commercial kit delivered by Dynamic Code, Linköping Sweden, allowing quantification of 6 pathogens and total number of Lactobacilli present. The pathogens are Gardnerella , Atopobium vaginae, Leptotrichia/Sneathia spp., Megasphaera spp., Mobiluncus spp. and bacterial vaginosis-associated bacterium 2 (BVAB2) all in relation to Lactobacilli. The Lactobacilli count includes all Lactobacilli present.

Exploratory efficacy variables applied were pH of the vaginal fluid on days 4 and 7 and quantitation of pathogens in relation to Lactobacilli as well on days 4 and 7.

The study comprises three visits. Visit 1 encompassed screening using Amsel criteria, modified Hay/Ison and treatment. After providing informed consent, patients were screened for eligibility. Eligible patients were included in the study and were asked about symptoms of itch, pain, malodour and vaginal discharge. They underwent a gynecological examination during which samples of vaginal fluid were collected by the Principal Investigator. The vaginal fluid samples were used for modified Hay/Ison grading (as “Normal”, “Intermediate” or “Bacterial vaginosis”) and for typing and quantification of the vaginal flora. Concomitant medications were recorded. The patients were then treated with one dose of the novel product. The patients were asked about their perceptions of the treatment. Adverse event (AE) recording started immediately after treatment. Treatment was not applied during days of menstruation or when menstruation was expected during the first 2 weeks after Visit 1.

First 10 patients

At visit 1 (day 1), patients were given kits (pH and dry smear/PCR test kits) for self-performed vaginal sampling and were instructed to use them daily during the first week after treatment. Self-obtained vaginal samples, for modified Hay/ Ison grading and assessment of the vaginal flora as well as recorded pH values, were sent to the study site every day.

Patients were contacted by telephone after the first week, visit 2. They were asked about AEs, concomitant medications, posttreatment menstruation and symptoms (itch, pain, malodour and vaginal discharge).

One week after the end of the first post-treatment menstruation, the patients also did self- performed vaginal sampling using the pH and dry smear/PCR test kits.

After the first post-treatment menstruation, the patients received a follow-up clinical consultation, Visit 3, in which they underwent a gynecological examination and were asked about AEs, concomitant medications and symptoms. An overall study design of the first 10 patient is illustrated in Figure 1.

Figure 1: Overall Study Design: First 10 Patients.

Subsequent 20 patients

The next part of the study was to evaluate three dose regimens. At visit 1 patients were provided with 2 additional doses of the novel product and kits, pH and dry smear/PCR test kits, for self-performed vaginal sampling. On day 4, 72 hours after the first dose of the novel product, patients did self-performed vaginal sampling at home before administering the second dose of the novel product. On day 7, 144 hours after the first dose of the novel product, patients did self-performed vaginal sampling at home before administering the third dose of the novel product. Patients did self-performed vaginal sampling 1 week after the final dose of the novel product and one week after the first post treatment menstruation. An overall study design of the subsequent 20 patient is illustrated in Figure 2.

Figure 2: Overall Study Design: First 20 Patients.

The study was conducted in compliance with the protocol, regulatory requirements, good clinical practice (GCP) and the ethical principles of the latest revision of the Declaration of Helsinki as adopted by the World Medical Association. The final study protocol and the final version of the patient information and consent form were reviewed and approved by an independent ethics committee (IEC) and MPA Sweden prior to inclusion of patients (EudraCT 2015-003356-51).

Statistical methods

The variability of the measurements associated with the primary objective was unknown when the present study was planned. The number of patients needed was therefore uncertain, but it was judged that 30 patients (fully evaluable) would be enough to meet the primary objective of the study.

Results

The demographics for the enrolled patients are shown in Table 1. Mean age was 28.6 years (range 18 to 42) for the first 10 patients and 31.7 (range 19 to 50) for the subsequent 20 patients.. Eight of the first 10 patients (80%) and 15 of the subsequent 20 patients (75%) had a regular sexual partner. The 2 patients not using contraception at baseline were advised about contraception use.

		First 10 patients	Subsequent 20 patients
Age (years)	No. of observations	10	20
	Mean	28.6	31.7
	Standard deviation	8.8	10.2
	Median	26	30.5
	Min	18	19
	Max	42	50
Regular menstruation, n (%)	Yes	8 (80)	20 (100)
	No	1 (10)	0 (0)
	Missing	1 (10)	0 (0)
Regular sexual partner, n (%)	Yes	8 (80)	15 (75)
	No	2 (20)	5 (25)
	Missing	0 (0)	0 (0)
Contraception, n (%)	None	1 (10)	2 (10)
	Hormone-based	6 (60)	5 (25)
	Condom	1 (10)	2 (10)
	Intrauterine device	0 (0)	10 (50)
	Pessary	0 (0)	0 (0)
	Other	2 (20)	1 (5)

Table 1: Baseline demographics.

All of the first 10 patients and 19 of the subsequent 20 patients fulfilled all 4 Amsel criteria at enrolment (Visit 1). The entire enrolled patient (30) was diagnosed with BV according to modified Hay/Ison.

Primary efficacy variable

Data for the single dos treatment are shown in Table 2. At day 2, all patients had a Hay/Ison grade of “normal”. The effect of the single dose languishes and at day 7 one patient was diagnosed “normal”, 3 intermediary and 4 had BV. One (10%) of the patients treated with a single dose (of the novel product) had a Hay/Ison grade of “Normal” 1 week after the end of the first post-treatment menstruation.

		Visit 1	Sampling
		Day 1	Day 2	Day 3	Day 4	Day 5	Day 6	Day 7	Within 1 week after the end of the first post-treatment menstruation
Hay/Ison	Number of observations	10	10	10	8	8	8	8	10
	Normal, n (%)	0 (0.0)	10 (100.0)	9 (90.0)	4 (50.0)	4 (50.0)	4 (50.0)	1 (12.5)	1 (10.0)
	Intermediate, n (%)	0 (0.0)	0 (0.0)	0 (0.0)	1 (12.5)	0 (0.0)	0 (0.0)	3 (37.5)	0 (0.0)
	Bacterial vaginosis, n (%)	10 (100.0)	0 (0.0)	1 (10.0)	3 (37.5)	4 (50.0)	4 (50.0)	4 (50.0)	9 (90.0)

Table 2: Hay/Ison grade at Visit 1 and during the First Week after Treatment: First 10 Patients.

For the subsequent 20 patients that received 3 doses of the novel product, 50% had a Hay/Ison grade of “normal” and 33% were intermediates after last treatment (day 7). One week after last treatment 47 % were diagnosed “normal” and 12% were intermediates, see Table 3. At the end point, 1 week after the end of the first post-treatment menstruation, 4 of 17 patients were regarded as normal (24%). One patient (6%) had a Hay/ Ison grade of “Intermediate”. This patient was shown to be cured at Visit 3. Inclusion of additional data for this patient, and for another patient, patient 20 who failed to provide a sample for Hay/Ison grading after the end of the first post-treatment menstruation but was shown at Visit 3 to have BV, gives a cure rate of 27.8% (5 of 18 patients).

		Visit 1	Treatment		Sampling	Sampling	Visit 3
		Day 1	Day 4	Day 7	Within 1 week after final dose	Within 1 week after the end of the first post-treatment menstruation	Within 1 month after the end of the first post-treatment menstruation
Hay/Ison	Number of observations	20	18	18	17	17	18
	Normal, n (%)	0 (0.0)	10 (55.6)	9 (50.0)	8 (47.1)	4 (23.5)	5 (27.8)
	Intermediate, n (%)	0 (0.0)	3 (16.7)	6 (33.3)	2 (11.8)	1 (5.9)a	0 (0.0)
	Bacterial vaginosis, n (%)	20 (100.0)	5 (27.8)	3 (16.7)	7 (41.2)	12 (70.6)	13 (72.2)

Table 3: Hay/Ison grade at Visit 1, Day 4, Day 7 and Within 1 Week after the Final Dose: Subsequent 20 Patients.

Exploratory endpoints Bacteriology

The sampling for microbiological testing was performed by the patients except for the first sampling occasion which was performed by health care professionals at the clinic. Patient performed sampling has been done before, with good results [14].

All patients were also tested for vaginal fluid microbiological status using PCR-analysis for Gardnerella vaginalis, Atophobium vaginae, Leptotrichia sp, Megasphaera sp, Mobiluncus sp and BVAB2. We have evaluated the presence of these bacteria in relation to the quantity of total Lactobacillus present.

The results of the testing demonstrate that the six pathogens monitored are immediately reduced and that Lactobacilli, including four different species, start to increase in numbers after the first dose. The effect on both pathogens and Lactobacilli after a single dose peaks after 2 to 3 days and is back to pretreatment values after 6 to 7 days (Figures 3 and 4)

Figure 3: Quantification of Vaginal Pathogens during treatment: First 10 Patients Data are shown as the mean and 95% confidence interval (n=10).
Abbreviations: Avag=A. vaginae,
BVAB2=Bacterial vaginosis-associated bacterium 2,
Gvag=G. vaginalis, Lepto=Leptotrichia/Sneathia spp.,
Mega=Megasphaera spp., Mobi=Mobiluncus spp.

Figure 4: Quantification of Vaginal Lactobacilli during treatment: First 10 Patients.
Data are shown as the mean and 95% confidence interval (n=10). Abbreviations: Ct=Threshold cycle, Lacto=Lactobacilli

In the group receiving 3 doses given three days apart, the initial effect seems identical, a rapid decrease of pathogens and an increase of Lactobacilli. However, the maximal effect is maintained for at least one week after last treatment (Figures 5 and 6). In the group receiving a single dose the effect started to decrease after two to three days. This indicates that multiple dosing can generate additional or accumulated effects.

Figure 5: Quantification of Vaginal Pathogens: Subsequent 20 Patients. Data are shown as the mean and 95% confidence interval (n=18).
Abbreviations: Avag=A. vaginae; BVAB2=Bacterial vaginosisassociated bacterium 2; Gvag=G. vaginalis, Lepto=Leptotrichia/ Sneathia spp.; Mega=Megasphaera spp.; Mobi=Mobiluncus spp.

Figure 6: Quantification of Vaginal Lactobacilli: Subsequent 20 Patients. Data are shown as the mean and 95% confidence interval (n=18). Abbreviations: Ct=Threshold cycle, Lacto=Lactobacilli

Post hoc exploratory analyses of vaginal pathogens and Lactobacilli were performed for subgroups of patients who received 3 doses of the product. Data for patients with a Hay/ Ison grade of “Normal” or “Intermediate” within 1 week after the end of the first post-treatment menstruation are shown in Figures 7 and 8. The initial decrease in the populations of pathogenic species and increase in total Lactobacilli numbers were maintained throughout the study period in these patients.

Figure 7: Quantification of Vaginal Pathogens: Subsequent 20 Patients (Patients with a Hay/Ison Grade of “Normal” or “Intermediate” within 1 Week after the End of the First Post- Treatment Menstruation) Data are shown as the mean and 95% confidence interval (n=5).
Abbreviations: Avag=A. vaginae, BVAB2=Bacterial vaginosisassociated bacterium 2, Gvag=G. vaginalis, Lepto=Leptotrichia/ Sneathia spp., Mega=Megasphaera spp., Mobi=Mobiluncus spp.

Figure 8: Quantification of Vaginal Lactobacilli: Subsequent 20 Patients (Patients with a Hay/Ison Grade of “Normal” or “Intermediate” within 1 Week after the End of the First Post- Treatment Menstruation). Data are shown as the mean and 95% confidence interval (n=5).
Abbreviations: Ct=Threshold cycle, Lacto=Lactobacilli

Therapeutic efficacy variables

The change in therapeutic parameters, itch, pain, malodour and vaginal discharge of the vaginal fluid during treatment compared with Visit 1 are shown in Table 4 (first 10 patients) and Table 5 (subsequent 20 patients). For patients who received a single dose of the product (first 10 patients), the 3 patients who reported itch at Visit 1 and 1 patient who reported pain at Visit 1 reported improvements in their symptoms at Visit 3. Compared to Visit 1, malodour was improved in all 10 patients at Visit 2 and in 5 patients (50%) at Visit 3. Vaginal discharge was improved in 80% of patients at Visit 2 and in 40% of patients at Visit 3.

		Visit 1	Visit 2	Visit 3
		Day 1	1-2 weeks	Within 4 weeks after the first post- treatment menstruation
Itch	No. of observations	10	10	10
	Severe, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Mild, n (%)	3 (30.0)	0 (0.0)	0 (0.0)
	No symptoms, n (%)	7 (70.0)	10 (100.0)	10 (100.0)
Pain	No. of observations	10	10	10
	Severe, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Mild, n (%)	1 (10.0)	1 (10.0)	0 (0.0)
	No symptoms, n (%)	9 (90.0)	9 (90.0)	10 (100.0)
Malodour	No. of observations	10	10	10
	Severe, n (%)	7 (70.0)	0 (0.0)	3 (30.0)
	Moderate, n (%)	3 (30.0)	2 (20.0)	4 (40.0)
	Mild, n (%)	0 (0.0)	3 (30.0)	0 (0.0)
	No symptoms, n (%)	0 (0.0)	5 (50.0)	3 (30.0)
Vaginal discharge	No. of observations	10	10	10
	Severe, n (%)	4 (40.0)	0 (0.0)	3 (30.0)
	Moderate, n (%)	2 (20.0)	2 (20.0)	3 (30.0)
	Mild, n (%)	3 (30.0)	4 (40.0)	0 (0.0)
	No symptoms, n (%)	1 (10.0)	4 (40.0)	4 (40.0)

Table 4: Bacterial Vaginosis Symptoms at Visit 1, Visit 2 and Visit 3: First 10 Patients.

		Visit 1	Visit 2	Visit 3
		Day 1	1-2 weeks	Within 4 weeks after the first post-treatment menstruation
Itch	No. of observations	20	19	17
	Severe, n (%)	0 (0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	0 (0)	0 (0.0)	0 (0.0)
	Mild, n (%)	5 (25.0)	2 (10.5)	1 (5.9)
	No symptoms, n (%)	15 (75.0)	17 (89.5)	16 (94.1)
Pain	No. of observations	20	19	17
	Severe, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	0 (0.0)	0 (0.0)	0 (0.0)
	Mild, n (%)	0 (0.0)	1 (5.3)	0 (0.0)
	No symptoms, n (%)	20 (100.0)	18 (94.7)	17 (100.0)
Malodour	No. of observations	20	19	17
	Severe, n (%)	4 (20.0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	11 (55.0)	0 (0.0)	3 (17.6)
	Mild, n (%)	5 (25.0)	1 (5.3)	3 (17.6)
	No symptoms, n (%)	0 (0.0)	18 (94.7)	11 (64.7)
Vaginal discharge	No. of observations	20	19	17
	Severe, n (%)	1 (5.0)	0 (0.0)	0 (0.0)
	Moderate, n (%)	12 (60.0)	0 (0.0)	2 (11.8)
	Mild, n (%)	6 (30.0)	2 (10.5)	6 (35.3)
	No symptoms, n (%)	1 (5.0)	17 (89.5)	9 (52.9)

Table 5: Bacterial Vaginosis Symptoms at Visit 1, Visit 2 and Visit 3: Subsequent 20 Patients.
The decline in number of observations were caused by patients that discontinued the study prematurely.
Data for vaginal fluid pH are shown in Table 6 and Figure 9 (first 10 patients) and in Table 6 and Figure 10 (subsequent 20 patients). For the first 10 patients, mean vaginal pH decreased from 5.4 at Visit 1 (day 1) to 4.8 at day 2 and 4.5 at day 3. Thereafter, it gradually increased to 4.9 at day 7. For samples obtained within 1 week after the end of the first post-treatment menstruation, mean pH was 5.2.

		Visit 1	Sampling
		Day 1	Day 2	Day 3	Day 4	Day 5	Day 6	Day 7	Within 1 week after the end of the first post-treatment menstruation
pH	No. of observations	10	10	10	8	8	8	8	7
	Mean	5.4	4.8	4.5	4.6	4.7	4.7	4.9	5.2
	95% confidence interval	5.2-5.5	4.6-5.0	4.2-4.8	4.3-4.9	4.4-5.0	4.5-5.0	4.6-5.2	4.8-5.5
	Min	5.0	3.6	3.6	3.6	3.6	3.6	3.6	3.8
	Q1	5.1	4.7	4.1	4.3	4.6	4.6	5.0	5.0
	Median	5.3	4.9	4.3	4.7	4.9	4.9	5.0	5.3
	Q3	5.6	5.2	5.0	4.8	5.1	5.1	5.1	5.5
	Max	6.1	5.3	5.6	5.6	5.3	5.3	5.3	6.1

Table 6: Vaginal Fluid pH: First 10 Patients.

For patients who received 3 doses of the product, malodor improved in 19 patients (100%) between Visit 1 and Visit 2, and was less severe at Visit 3 vs Visit 1 in 16 patients (94.1%). Vaginal discharge improved in 17 patients (89.5%) between Visit 1 and Visit 2, and was less severe at Visit 3 vs Visit 1 in 13 patients (76.5%). Itch was an infrequent symptom at Visit 1, but showed improvements at Visit 2 and Visit 3 in some patients. Pain was very infrequent, and no improvements were seen at Visit 2 or Visit 3 (Tables 5 and 6).

For the subsequent 20 patients, mean vaginal pH decreased from 5.3 at Visit 1, to 5.0 at day 4, 4.8 at day 7 and 4.6 for samples obtained within 1 week after the final dose of the novel product. For samples obtained within 1 week after the end of the first post- treatment menstruation, mean pH was 4.9 (Table 7 and Figures 9 and 10). pH for patients with a Hay/Ison grade of “Normal” or “Intermediate” within 1 week after the end of the first post-treatment menstruation are shown in Figure 11. The mean pH was maintained normal throughout the study period in these patients.

Figure 9: Vaginal Fluid pH: First 10 Patients. Data are shown as the mean and 95% confidence interval (n=10).

Figure 10: Vaginal Fluid pH: Subsequent 20 Patients. Data are shown as the mean and 95% confidence interval (n=20).

Figure 11: Vaginal Fluid pH: Subsequent 20 Patients. (Patients with a Hay/Ison Grade of “Normal” or “Intermediate” within 1 Week after the End of the First Post-Treatment Menstruation) Data are shown as the mean and 95% confidence interval (n=5).

		Visit 1	Treatment		Sampling
		Day 1	Day 4	Day 7	Within 1 week after the final dose	Within 1 week after the end of the first post-treatment menstruation
pH	No. of observations	20	18	18	17	17
	Mean	5.3	5.0	4.8	4.6	4.9
	95% confidence interval	5.2-5.5	4.7-5.3	4.5-5.0	4.3-4.9	4.7-5.2
	Min	4.7	4.1	4.1	3.6	3.6
	Q1	5.3	4.7	4.1	4.1	4.7
	Median	5.3	5.0	4.7	4.4	5.0
	Q3	5.6	5.3	5.2	5.0	5.3
	Max	5.6	6.1	5.6	5.6	6.1

Table 7: Vaginal Fluid pH: Subsequent 20 Patients.

Safety

The product was well tolerated. No AEs judged to be related to the treatment were reported. There were no SAEs or deaths and no AEs resulted in a patient discontinuing study treatment or being withdrawn from the study. No unscheduled gynaecological examinations were needed during or after treatment.

Adverse events

There were 11 adverse events (AEs), all unique, in 10 patients see Table 8. The most frequent AEs were Headache, 3 patients, (10%), Fever, 2 patients, (7%) and Cold 2 patients, (7%). All other AEs occurred in a single patient. Two AEs, migraine and influenza, in 1 patient treated with a single dose of the novel product, patient 10, were judged to be moderate while all other AEs were judged to be mild. All AEs were judged to be unrelated to the study treatment. No AE was judged to be serious. All AEs were resolved by the end of the study

Primary adverse event description	First 10 patients	Subsequent 20 patients	All patients
Fever	1 (10)	1 (5)	2 (7)
Headache	1 (10)	2 (10)	3 (10)
Migraine	1 (10)		1 (3)
Cold	1 (10)	1 (5)	2 (7)
Influenza	1 (10)		1 (3)
Urethritis		1 (5)	1 (3)
Smarting before menstruation		1 (5)	1 (3)

Table 8: Adverse Events by Primary Adverse Event Description.

Discussion

The results of the primary efficacy parameter were, for both groups, a rapid increase of healthy patients. After single treatment the effect, the number of patients defined as “normal” by Hay/Ison peaked day 2/3 and after repeated dosing the peak came during treatment, day 1 to 7. This is supported by the bacteriological data showing rapid onset for both treatment schedules and peaked (minimum pathogens and maximum Lactobacilli) day 3 for single dose and day 1 to 7+ for triple treatment. The results for therapeutic parameters, mainly pH, malodour and abnormal discharge, support this statement. With the regard to duration it’s interesting to note that the decline in effect demonstrated after single dose is much slower than if three doses are applied. One week after start of treatment the remaining cured patients were 12.5% while the number of improved were 50% (normal + intermediary) after single dose. The corresponding Figures for triple doses are 50.0% and 83.3%. This indicates an accumulation of the effect takes place when the number of doses is increased. This is further emphasized when therapeutic parameters such as malodour and vaginal discharge are considered. After the first post treatment menstruation in the single dose treated, 30% of the patients had no symptoms (malodour) compared to 64.7% after three doses. These results are superior to the symptom relief achieved with local antibiotic treatment [11].

As indicated by the PCR data on microbiology, the rapid reduction of pathogens coincides with a rapid increase in the number of Lactobacilli. This indicates that Lactobacilli species, L.crispatus, L.jenseni, L.gasseri, and L.iners are not sensitive to hydrogen peroxide. It should however not come as a surprise since Lactobacilli are known produce concentrations in the mM range of hydrogen peroxide in the surrounding media. Hydrogen peroxide and lactic acid producing Lactobacilli that colonise the vagina mucus have been reported to reduce the prevalence of bacterial vaginosis [15,16]. These H₂O₂-producing Lactobacilli were isolated from higher percentages of samples of vaginal fluid from healthy women than from those with bacterial vaginosis [17]. This bactericidal action seems inhibited by catalase but not by inactivated catalase and was not exhibited by non-H₂O₂-producing Lactobacilli. Vaginal peroxidase plus a halide (e.g., chloride) would be expected to enhance the lethal action of H₂O₂ formed by Lactobacilli, and this may contribute to the control of the vaginal flora [18]. As indicated earlier the antimicrobial activities of Lactobacilli strains against bacterial pathogens appears to be bifactual as Atassi et al. [19] have investigated the respective contribution of lactic acid and hydrogen peroxide in killing bacterial pathogen associated with human vagina with hydrogen peroxide concentration from 0-15 µg/ml of and the lactic acid concentration at 70 mM showing a co-operative antimicrobial effect.

The monoglycerides have been used extensively in the cosmetic and food industry and are naturally occurring in sunflower oil. The antimicrobial properties of the monoglycerides have been shown in a double blind randomized study with 36 women how were treated with a 0.5% or 5% glycerol monolaurate gel. G. vaginalis and Candida was significantly reduced but Lactobacilli were not affected [20].

There seem to be a strong link between the parameters we have studied, clinical in the form of Hay/Ison, microbiological by PCR and therapeutic in the form of pH, malodour, pain itch and vaginal discharge. One further indication on the strong correlation between clinical, therapeutic and bacteriological parameters was found when we compared bacteriology data from patients regarded as intermediary or healthy see Figure 7 and 8. In these patients there is no decrease in Lactobacilli and no increase in pathogens. This is very interesting that the pathogens still are possible to detect even if the women are free of BV. These findings are new and could in some way explain why women with BV have a high frequency of relapse. One theory of the relapse of BV is that the biofilm in vagina is maintained protecting the pathogenic bacteria [21].

Our result could suggest that treatment with this product will in some way even destroy the biofilm making the pathogenic bacteria more harmless.

In this initial study we have learned that the new formulation reduces pathogens and symptoms of infection rapidly with long term effect and this property may be useful for the treatment of other local vaginal infections such as STI. Another aspect that should be discussed is the statement that the components reducing pH and bacterial numbers, hydrogen peroxide and lactic acid, are unlikely to generate development of resistan ce. This is in strong contrast to the current preferred medication, Clindamycin, an antibiotic which might have a inhibiting effect on Lactobacilli and is subject to development of resistance [22-29].

One disadvantage of our study is that we did not treat or control her partner. In our study 75% patients had regular partners and we did not encourage the women to abstain from sexual intercourse nor to use condom.

Conclusion

Treatment of BV and symptoms thereof using a combination of hydrogen peroxide, lactic acid and a stabilising lipid, the novel formulation produced predictable results with a strong correlation between most clinical parameters, Hay/Ison and bacteriological ditto. The product had a rapid effect on Hay/ Ison grade and produced long-lasting improvements in symptoms, even in patients with relapse of BV. At three doses the cure rate, about 30% after post treatment menstruation, is in line with the results for frequent local vaginal metronidazole treatment but with superior symptoms relief. Increase of dose, dose frequency and number of doses will most likely increase cure rate. This statement is speculative since none comparative studies are made yet. The novel formulation did not interfere with Lactobacilli growth in contrast to local antibiotics such as clindamycine and was found safe and was tolerated by patients.

Conflict of interest

In order to conduct this study Skaraborgs Hospital in Skövde received scientific founding from Pharmiva AB, Sankt Lars väg 45, SE 222 70 Sweden for salary to the scientific nurse.

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Article Information

Aritcle Type: RESEARCH ARTICLE

Citation: Breding K, Lindal A, Sagna D, Larsson P-G (2018) Novel NonAntibiotic Treatment of Bacterial Infections of the Vagina, A Proof of Concept Study using Single Dose and Triple Dose Regimen. Gynecol Women’s Health Res 1(1): dx.doi.org/10.16966/2689-3096.108

Copyright: © 2018 Breding K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Publication history: 

Received date: 16 Mar, 2018

Accepted date: 17 Apr, 2018

Published date: 25 Apr, 2018