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Stoner MCD, Mathebula F, Sedze N, Seyama L, Mohuba R, Fabiano Z, Etima J, Young A, Scheckter R, van der Straten A, Piper J, Noguchi L, Montgomery ET, Balán IC. Depression Among Pregnant and Breastfeeding Persons Participating in Two Randomized Trials of the Dapivirine Vaginal Ring and Oral Pre-Exposure Prophylaxis (PrEP) in Malawi, South Africa, Uganda, and Zimbabwe. AIDS Behav 2024:10.1007/s10461-024-04321-2. [PMID: 38526641 DOI: 10.1007/s10461-024-04321-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/11/2024] [Indexed: 03/27/2024]
Abstract
Depression is associated with lower adherence to oral pre-exposure prophylaxis (PrEP) to prevent HIV, but data are not currently available on how depression may affect use of other HIV prevention methods including the dapivirine vaginal ring (DVR). We conducted a mixed methods study using data from the Microbicide Trials Network (MTN) 042/DELIVER (n = 558) and MTN-043/B-PROTECTED (n = 197) studies to describe the prevalence of depressive symptoms and explore how depressive symptoms may have influenced attitudes about use of the monthly DVR and once-daily oral PrEP tablet among pregnant and breastfeeding persons, respectively, in Malawi, South Africa, Uganda, and Zimbabwe. Eleven participants had high Edinburgh Postnatal Depression scores ≥ 10 in MTN-042/DELIVER (2%) and four participants (2%) in MTN-043/B-PROTECTED. In interviews with 9 participants who had high scores (6 DVR, 3 oral PrEP), those with depressive symptoms described overlapping stressors which were magnified by job loss and economic instability during the COVID-19 pandemic, and by experiences of pregnancy/postpartum. These participants experienced a lack of support from partners or family members, and conflict with partners related to trust, and infidelity. While we did not find evidence of a change in product adherence, there was a strong sense of commitment and motivation to use the study products for protection from HIV for participants themselves and their baby. Although lack of social support is usually an obstacle to adherence, in this study, the participants' lives and relationships seemed to have reinforced the need for HIV prevention and motivated women to protect themselves and their babies from HIV.
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Affiliation(s)
| | - Florence Mathebula
- Wits RHI, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Natasha Sedze
- Clinical Trials Research Centre, University of Zimbabwe, Harare, Zimbabwe
| | - Linly Seyama
- Johns Hopkins Project, Kamuzu University of Health Sciences, Blantyre, Malawi
| | - Rebone Mohuba
- Wits RHI, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Zayithwa Fabiano
- Johns Hopkins Project, Kamuzu University of Health Sciences, Blantyre, Malawi
| | - Juliane Etima
- Makerere University - Johns Hopkins University (MU-JHU) Research Collaboration, Kampala, Uganda
| | | | | | | | - Jeanna Piper
- National Institute of Allergy and Infectious Diseases (NIAID), Bethesda, MD, USA
| | - Lisa Noguchi
- Division of Reproductive, Maternal, Newborn, Child and Adolescent Health, Jhpiego/Johns Hopkins University, Washington, DC, USA
| | | | - Iván C Balán
- Florida State University College of Medicine, Tallahassee, FL, USA
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Dadabhai S, Quaynor L, Bandala-Jacques A, Seyama L, Rahman MH, Phiri R, Decker MR, Taha TE. Intimate partner violence and excess fertility among women of reproductive age in Malawi. PLoS One 2024; 19:e0297959. [PMID: 38277363 PMCID: PMC10817113 DOI: 10.1371/journal.pone.0297959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 01/14/2024] [Indexed: 01/28/2024] Open
Abstract
PURPOSE Gender inequity and adverse health outcomes continue to be of concern among women in sub-Saharan Africa. We determined prevalence of intimate partner violence and excess fertility (having more children than desired) in reproductive age women in Malawi. We also explored factors associated with these outcomes and with spousal fertility intentions. PATIENTS AND METHODS In a cross-sectional study, a total of 360 women and 410 men were recruited using multi-stage sampling from communities in a peri-urban setting in Blantyre District, Southern Malawi in 2021. Women and men were separately interviewed by trained study workers using a structured questionnaire. In addition to descriptive analyses, we used univariate and multivariate logistic regression models to assess associations of risk factors with the outcomes of intimate partner violence and excess fertility. RESULTS Among women, lifetime prevalence of intimate partner violence was 23.1%, and excess fertility was experienced by 25.6%. Intimate partner violence was associated with male partners alcohol consumption (adjusted odds ratio 2.13; P = 0.019). Women were more likely to report excess fertility if they were older (adjusted odds ratio 2.0, P<0.001, for a 5-year increase). Alcohol consumption by the male partner (adjusted odds ratio 2.14; P = 0.025) and women being able to refuse sex with their male partner (adjusted odds ratio 0.50; P = 0.036) were associated with discordant fertility preferences. CONCLUSIONS Intimate partner violence, excess fertility, and social and health inequities continue to be prevalent in Malawi. These data suggest the underlying proximal and distal factors associated with these adverse outcomes such as alcohol consumption may be addressed through education, couple interactive communication, and community dialogue. To ensure sustainability and effectiveness, strong leadership involvement, both governmental and non-governmental, is needed.
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Affiliation(s)
- Sufia Dadabhai
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Laura Quaynor
- Department of Advanced Studies in Education, Johns Hopkins School of Education, Baltimore, Maryland, United States of America
| | - Antonio Bandala-Jacques
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Linly Seyama
- Kamuzu University of Health Sciences-Johns Hopkins Research Project, Blantyre, Malawi
| | - Md Hafizur Rahman
- Department of International Health, Johns Hopkins School of Public Health, Baltimore, MD, United States of America
| | | | - Michele R. Decker
- Department of Population, Family & Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Taha E. Taha
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
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Browne EN, Torjesen K, Mirembe BG, Palanee-Phillips T, Jeenarain N, Chitukuta M, Stoner MCD, Mansoor LE, Reddy K, Tauya TT, Naidoo L, Siva S, Richardson B, Dadabhai S, Seyama L, Soto-Torres L, van der Straten A. Acceptability of the dapivirine vaginal ring for HIV-1 prevention among women reporting engagement in transactional sex. AIDS Care 2024; 36:80-86. [PMID: 37066990 PMCID: PMC10579446 DOI: 10.1080/09540121.2023.2198187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 03/27/2023] [Indexed: 04/18/2023]
Abstract
We assessed if acceptability of the dapivirine vaginal ring for HIV prevention differed among the subgroup of women who reported engaging in transactional sex prior to enrollment in MTN-020/ASPIRE (phase III trial in Malawi, South Africa, Uganda, and Zimbabwe, 2012-2015; n = 2629). Transactional sex was defined as receipt of money, goods, gifts, drugs, or shelter in exchange for sex in the past year. Dimensions of acceptability included: ease of use and physical sensation in situ, impacts on sex, partner's opinion, and likelihood of future use. We used Poisson regression models with robust standard errors to compare risk of acceptability challenges by baseline history of transactional sex. At product discontinuation, women exchanging sex found the ring comfortable (90%), easy to insert (92%) and nearly all (96%) were likely to use the ring in the future. Women who had exchanged sex were more likely to report feeling the ring during sex (ARR 1.43, 95% CI: 1.09, 1.89; p = 0.01) and slightly more likely to mind wearing the ring during menses (ARR 1.22, 95% CI: 1.01, 1,46; p = 0.04) and during sex (ARR 1.22, 95% CI: 1.02, 1.45; p = 0.03). Messaging and counseling should include enhanced support for use during sex and menses to support optimal use.
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Affiliation(s)
- Erica N. Browne
- Women’s Global Health Imperative, RTI International,
Berkeley, CA, USA
| | | | - Brenda Gati Mirembe
- Makerere University-Johns Hopkins University Research
Collaboration, Kampala, Uganda
| | - Thesla Palanee-Phillips
- Wits Reproductive Health and HIV Institute, Faculty of
Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | | | - Miria Chitukuta
- University of Zimbabwe Clinical Trials Research Centre,
Harare, Zimbabwe
| | | | - Leila E. Mansoor
- Centre for the AIDS Programme of Research in South Africa
(CAPRISA), University of KwaZulu-Natal, Durban, South Africa
| | - Krishnaveni Reddy
- Wits Reproductive Health and HIV Institute, Faculty of
Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Thelma T. Tauya
- University of Zimbabwe Clinical Trials Research Centre,
Harare, Zimbabwe
| | | | - Samantha Siva
- South African Medical Research Council, Durban, South
Africa
| | - Barbra Richardson
- Department of Biostatistics, University of Washington,
Seattle, WA, USA
| | - Sufia Dadabhai
- College of Medicine-John Hopkins University Research
Project, Blantyre, Malawi
| | - Linly Seyama
- College of Medicine-John Hopkins University Research
Project, Blantyre, Malawi
| | - Lydia Soto-Torres
- Division of AIDS, National Institute of Allergy and
Infectious Diseases, National Institutes of Mental Health, and Eunice Shriver
Kennedy, National Institute of Child Health and Human Development, National
Institutes of Health, Bethesda, MD, USA
| | - Ariane van der Straten
- University of California San Francisco, San Francisco, CA,
USA
- ASTRA Consulting, Kensington, PA, USA
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Stoner MCD, Hawley I, Mathebula F, Horne E, Etima J, Kemigisha D, Mutero P, Dandadzi A, Seyama L, Fabiano Z, Scheckter R, Noguchi L, Owor M, Balkus JE, Montgomery ET. Acceptability and Use of the Dapivirine Vaginal Ring and Daily Oral Pre-exposure Prophylaxis (PrEP) During Breastfeeding in South Africa, Malawi, Zimbabwe, and Uganda. AIDS Behav 2023; 27:4114-4123. [PMID: 37432541 PMCID: PMC10615878 DOI: 10.1007/s10461-023-04125-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2023] [Indexed: 07/12/2023]
Abstract
This study examines qualitative acceptability of the dapivirine vaginal ring (DVR) and oral daily pre-exposure prophylaxis (PrEP) among breastfeeding persons participating in Microbicide Trials Network 043/B-PROTECTED, a phase 3B safety and drug detectability study of DVR and oral PrEP in breastfeeding. A subsample of 52 participants were purposively sampled to participate in an in-depth interview (IDI). Breastfeeding participants found both study products to be acceptable, and easy to use. A common motivation for product use was to protect the baby from HIV, although participants' understanding of how the study drug would work to protect their babies was often unclear. While most participants did not report experiencing side effects, fears about side effects were common as both initial worries about how the study products would affect their health and the health of their baby, and increased anxiety that health issues experienced by them, or their baby were from the products.
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Affiliation(s)
- Marie C D Stoner
- Women's Global Health Imperative, RTI International, 2150 Shattuck Avenue, Berkeley, CA, 94104, USA.
| | - Imogen Hawley
- Women's Global Health Imperative, RTI International, 2150 Shattuck Avenue, Berkeley, CA, 94104, USA
| | - Florence Mathebula
- Wits Reproductive Health and HIV Institute, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Elizea Horne
- Wits Reproductive Health and HIV Institute, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Juliane Etima
- Makerere University-Johns Hopkins University (MU-JHU) Research Collaboration, Kampala, Uganda
| | - Doreen Kemigisha
- Makerere University-Johns Hopkins University (MU-JHU) Research Collaboration, Kampala, Uganda
| | - Prisca Mutero
- Clinical Trials Research Centre, University of Zimbabwe, Harare, Zimbabwe
| | - Adlight Dandadzi
- Clinical Trials Research Centre, University of Zimbabwe, Harare, Zimbabwe
| | - Linly Seyama
- Johns Hopkins Project, College of Medicine, University of Malawi, Blantyre, Malawi
| | - Zayithwa Fabiano
- Johns Hopkins Project, College of Medicine, University of Malawi, Blantyre, Malawi
| | | | - Lisa Noguchi
- Division of Reproductive, Maternal, Newborn, Child and Adolescent Health, Jhpiego/Johns Hopkins University, Washington, DC, USA
| | - Maxensia Owor
- Makerere University-Johns Hopkins University (MU-JHU) Research Collaboration, Kampala, Uganda
| | - Jennifer E Balkus
- Department of Epidemiology, University of Washington School of Public Health, Seattle, USA
- Vaccine and Infectious Disease Division, Fred Hutch Cancer Center, Seattle, USA
| | - Elizabeth T Montgomery
- Women's Global Health Imperative, RTI International, 2150 Shattuck Avenue, Berkeley, CA, 94104, USA
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Ryan JH, Young A, Musara P, Reddy K, Macagna N, Guma V, Seyama L, Piper J, van der Straten A. Sexual Attitudes, Beliefs, Practices, and HIV Risk During Pregnancy and Post-delivery: A Qualitative Study in Malawi, South Africa, Uganda, and Zimbabwe. AIDS Behav 2022; 26:996-1005. [PMID: 34907478 PMCID: PMC8840901 DOI: 10.1007/s10461-021-03454-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/27/2021] [Indexed: 12/03/2022]
Abstract
Women who acquire HIV during the pregnancy and breastfeeding periods have a higher risk of transmitting the virus to their child than women who become infected with HIV before pregnancy. We explore the context of sexual beliefs and practices that may shape both HIV risk and willingness to use HIV prevention products during pregnancy and postpartum in Malawi, South Africa, Uganda and Zimbabwe. Twenty-three single sex focus group discussions and 36 in-depth interviews took place between May and November 2018 with recently pregnant or breastfeeding women, men, mothers and mothers-in-law of pregnant or breastfeeding women, and key informants. Participants across study groups and sites (N = 232) reported various perceived benefits and harms of sex during pregnancy and postpartum. Participants discussed reasons why men might seek sex outside of the relationship. There is a critical need for alternative prevention options to protect pregnant and breastfeeding women from HIV.
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Affiliation(s)
- Julia H. Ryan
- Women’s Global Health Imperative (WGHI), RTI International, Berkeley, CA USA
| | - Alinda Young
- Women’s Global Health Imperative (WGHI), RTI International, Berkeley, CA USA
| | - Petina Musara
- University of Zimbabwe College of Health Sciences Clinical Trials Research Centre, Harare, Zimbabwe
| | - Krishnaveni Reddy
- Wits Reproductive Health and HIV Institute (Wits RHI), University of the Witwatersrand, Johannesburg, South Africa
| | | | - Victor Guma
- Makerere University – Johns Hopkins University Research Collaboration, Kampala, Uganda
| | - Linly Seyama
- Johns Hopkins Project-College of Medicine, University of Malawi, Blantyre, Malawi
| | | | - Ariane van der Straten
- Women’s Global Health Imperative (WGHI), RTI International, Berkeley, CA USA
- Center for AIDS Prevention Studies (CAPS), University of California San Francisco, San Francisco, CA USA
| | - the MTN-
041/MAMMA Study Team
- Women’s Global Health Imperative (WGHI), RTI International, Berkeley, CA USA
- University of Zimbabwe College of Health Sciences Clinical Trials Research Centre, Harare, Zimbabwe
- Wits Reproductive Health and HIV Institute (Wits RHI), University of the Witwatersrand, Johannesburg, South Africa
- FHI 360, Durham, NC USA
- Makerere University – Johns Hopkins University Research Collaboration, Kampala, Uganda
- Johns Hopkins Project-College of Medicine, University of Malawi, Blantyre, Malawi
- DAIDS, NIH/NIAID, Bethesda, MD USA
- Center for AIDS Prevention Studies (CAPS), University of California San Francisco, San Francisco, CA USA
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Flax VL, Hawley I, Ryan J, Chitukuta M, Mathebula F, Nakalega R, Seyama L, Taulo F, van der Straten A. After their wives have delivered, a lot of men like going out: Perceptions of HIV transmission risk and support for HIV prevention methods during breastfeeding in sub-Saharan Africa. Matern Child Nutr 2021; 17:e13120. [PMID: 33325126 PMCID: PMC7988874 DOI: 10.1111/mcn.13120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 11/09/2020] [Accepted: 11/18/2020] [Indexed: 02/06/2023]
Abstract
Female-initiated HIV prevention methods, such as oral pre-exposure prophylaxis (PrEP) and the vaginal ring, may be important risk reduction strategies for breastfeeding women. Given their novelty, information about the sociocultural context and how it influences perceptions of and support for their use during breastfeeding is lacking. To address this gap, we conducted 23 focus group discussions separately with pregnant and breastfeeding women, male partners and grandmothers (N = 196) and 36 in-depth interviews with key informants in Malawi, South Africa, Uganda and Zimbabwe. We analysed the data using a framework analysis method. Overall, breastfeeding was the norm, and participants described the transference of health (e.g., nutrition) and disease (e.g., HIV) to children through breast milk. Participants considered the early breastfeeding period as one of high HIV transmission risk for women. They explained that male partners tend to seek outside sexual partners during this period because women need time to recover from delivery, women focus their attention on the child, and some men are disgusted by breast milk. Participants highlighted concerns about the drugs in oral PrEP transferring to the child through breast milk, but fewer worried about the effects of the vaginal ring because the drug is localized. Women, grandmothers and key informants were supportive of women using these HIV prevention methods during breastfeeding, while male partners had mixed opinions. These findings can be used to tailor messages for promoting the use of PrEP or the vaginal ring during breastfeeding in sub-Saharan Africa.
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Affiliation(s)
| | - Imogen Hawley
- Women's Global Health Imperative (WGHI)RTI InternationalBerkeleyCAUSA
| | - Julia Ryan
- Women's Global Health Imperative (WGHI)RTI InternationalBerkeleyCAUSA
| | - Miria Chitukuta
- University of Zimbabwe College of Health Sciences Clinical Trials Research CentreHarareZimbabwe
| | - Florence Mathebula
- Wits Reproductive Health and HIV Institute (Wits RHI)University of the WitwatersrandJohannesburgSouth Africa
| | - Rita Nakalega
- Makerere University‐Johns Hopkins University Research CollaborationKampalaUganda
| | - Linly Seyama
- Johns Hopkins Project, College of MedicineUniversity of MalawiBlantyreMalawi
| | - Frank Taulo
- Johns Hopkins Project, College of MedicineUniversity of MalawiBlantyreMalawi
| | - Ariane van der Straten
- Women's Global Health Imperative (WGHI)RTI InternationalBerkeleyCAUSA
- Center for AIDS Prevention Studies (CAPS)University of California San FranciscoSan FranciscoCAUSA
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7
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Ali M, Nelson A, Luquero FJ, Azman AS, Debes AK, M'bang'ombe MM, Seyama L, Kachale E, Zuze K, Malichi D, Zulu F, Msyamboza KP, Kabuluzi S, Sack DA. Safety of a killed oral cholera vaccine (Shanchol) in pregnant women in Malawi: an observational cohort study. Lancet Infect Dis 2017; 17:538-544. [PMID: 28161570 PMCID: PMC5406486 DOI: 10.1016/s1473-3099(16)30523-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 11/02/2016] [Accepted: 11/14/2016] [Indexed: 11/04/2022]
Abstract
Background Pregnancy increases the risk of harmful effects from cholera for both mothers and their fetuses. A killed oral cholera vaccine, Shanchol (Shantha Biotechnics, Hydrabad, India), can protect against the disease for up to 5 years. However, cholera vaccination campaigns have often excluded pregnant women because of insufficient safety data for use during pregnancy. We did an observational cohort study to assess the safety of Shanchol during pregnancy. Methods This observational cohort study was done in two adjacent districts (Nsanje and Chikwawa) in Malawi. Individuals older than 1 year in Nsanje were offered oral cholera vaccine during a mass vaccination campaign between March 30 and April 30, 2015, but no vaccines were administered in Chikwawa. We enrolled women who were exposed to oral cholera vaccine during pregnancy in Nsanje district, and women who were pregnant in Chikwawa district (and thus not exposed to oral cholera vaccine) during the same period. The primary endpoint of our analysis was pregnancy loss (spontaneous miscarriage or stillbirth), and the secondary endpoints were neonatal deaths and malformations. We evaluated these endpoints using log-binomial regression, adjusting for the imbalanced baseline characteristics between the groups. This study is registered with ClinicalTrials.gov, number NCT02499172. Findings We recruited 900 women exposed to oral cholera vaccine and 899 women not exposed to the vaccine between June 16 and Oct 10, 2015, and analysed 835 in each group. 361 women exposed to the vaccine and 327 not exposed to the vaccine were recruited after their pregnancies had ended. The incidence of pregnancy loss was 27·54 (95% CI 18·41–41·23) per 1000 pregnancies among those exposed to the vaccine and 21·56 (13·65–34·04) per 1000 among those not exposed. The adjusted relative risk for pregnancy loss among those exposed to oral cholera vaccine was 1·24 (95% CI 0·64–2·43; p=0·52) compared with those not exposed to the vaccine. The neonatal mortality rate was 11·78 (95% CI 5·92–23·46) per 1000 livebirths for infants whose mothers were exposed to oral cholera vaccine versus 8·91 (4·02–19·77) per 1000 livebirths for infants whose mothers were not exposed to the vaccine (crude relative risk 1·32, 95% CI 0·46–3·84; p=0·60). Only three newborn babies had malformations, two in the vaccine exposure group and one in the no-exposure group, yielding a relative risk of 2·00 (95% CI 0·18–22·04; p=0·57), although this estimate is unreliable because of the small number of outcomes. Interpretation Our study provides evidence that fetal exposure to oral cholera vaccine confers no significantly increased risk of pregnancy loss, neonatal mortality, or malformation. These data, along with findings from two retrospective studies, support use of oral cholera vaccine in pregnant women in cholera-affected regions. Funding Bill & Melinda Gates Foundation.
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Affiliation(s)
- Mohammad Ali
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
| | - Allyson Nelson
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | | | - Andrew S Azman
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Amanda K Debes
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | | | | | | | | | | | | | | | - Storn Kabuluzi
- Preventive Health Services Department, Ministry of Health, Lilongwe, Malawi
| | - David A Sack
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
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Seyama L, Irisawa H, Honda T, Takeda T, Miwatani T. Increase in membrane conductance and positive inotropic action of hemolysin produced by Vibrio parahaemolyticus on rabbit myocardium. Recent Adv Stud Cardiac Struct Metab 1976; 11:621-5. [PMID: 1031962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The effects of purified thermostable direct hemolysin from the cultured filtrate of Vibrio parahaemolyticus on both S-A node cells and atrial cells were studied electrophysiologically. Hemolysin caused the membrane conductance to increase, thereby causing membrane depolarization. The major ion responsible for this depolarization was Na+, but other ions, such as K+ and Ca2+, also participated. Positive inotropic action of hemolysin was observed, and the Na-Ca exchange mechanism was enhanced after hemolysin treatment.
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