Publications by authors named "Betty Njoroge"

Background: The World Health Organization recommends a single-dose human papillomavirus (HPV) vaccination schedule for girls and boys to accelerate progress toward cervical cancer elimination. We applied the Theoretical Framework of Acceptability (TFA) within the context of HPV vaccination to assess the acceptability of a single-dose schedule among health-care professionals in Kenya.

Methods: A REDCap survey was developed using relevant Theoretical Framework of Acceptability domains and validated with health-care professionals.

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Article Synopsis
  • - The KEN SHE trial demonstrated over 97% efficacy for a single-dose HPV vaccine against HPV16 and HPV18 infections in Kenyan women over 36 months.
  • - The DoRIS trial involved 930 Tanzanian girls aged 9-14, examining antibody responses from one, two, or three doses of either 2-valent (Cervarix) or 9-valent (Gardasil-9) vaccines, finding comparable or higher antibody levels at 24 months compared to the KEN SHE participants.
  • - Results indicated that a single dose of either HPV vaccine effectively induced immune responses in young girls, suggesting it may be sufficient for protection, similar to the responses seen in older women who had received a single
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Cervical cancer burden is high where prophylactic vaccination and screening coverage are low. We demonstrated in a multicenter randomized, double-blind, controlled trial that single-dose human papillomavirus (HPV) vaccination had high vaccine efficacy (VE) against persistent infection at 18 months in Kenyan women. Here, we report findings of this trial through 3 years of follow-up.

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We investigated condom use at last sexual intercourse among adolescent girls and young women (AGYW) to determine the prevalence and correlates of condom use pre- and post-COVID-19 lockdown. Condom use was compared pre- and post-COVID-19 lockdown using a single group interrupted time series analysis. Multivariable Poisson regression was used to determine the correlates of condom use at last sexual intercourse.

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Background: Cervical cancer is the leading cause of cancer-related deaths among Kenyan women. Persistent infection with high-risk oncogenic Human papillomavirus (HPV) genotypes is a necessary cause of cervical cancer. HPV vaccines are safe, durable, and efficacious in preventing incident HPV infections.

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  • Many young women globally experience the dual challenges of HIV and unintended pregnancies, highlighting the need for multipurpose prevention technologies.
  • A study involving 312 healthy women aged 18-34 randomized participants to use either a tenofovir/levonorgestrel (TFV/LNG), TFV-only, or placebo intravaginal ring to assess safety and effectiveness.
  • Results showed that both TFV IVR groups demonstrated significant increases in HIV inhibition in cervicovaginal fluid, with no serious adverse effects linked to the products, indicating their potential as safe prevention methods.
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In a phase-IIa trial, we investigated the influence of 90 days continuous-delivery tenofovir (TFV) intravaginal rings (IVRs) with/without levonorgestrel (LNG) on the genital microbiota of Kenyan women. Eligible women (n = 27; 18-34 years; negative for HIV, sexually transmitted infections, and Amsel-bacterial vaginosis) were randomized 2:2:1 to use of IVRs containing TFV, TFV/LNG, or placebo. Using vaginal wall and IVR swabs at IVR insertion and removal, the genital microbial composition was determined using 16S rRNA gene sequencing.

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  • A randomized clinical trial was conducted in Kenya to evaluate the efficacy of single-dose nonavalent and bivalent HPV vaccines against a meningococcal vaccine among women aged 15 to 20.
  • The results indicated that both the nonavalent and bivalent HPV vaccines had very high efficacy rates (97.5%) in preventing persistent infections of HPV types 16 and 18, while significantly fewer infections occurred in the HPV vaccine groups compared to the meningococcal vaccine group.
  • Overall, the study supports the potential for single-dose HPV vaccination to simplify vaccination processes and decrease healthcare costs while maintaining strong protective effects against targeted HPV infections.
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Background: Cervical cancer incidence is high in Kenya due to HIV and limited access to cancer prevention services. Human papillomavirus (HPV) has been shown to increase HIV acquisition; however, the potential impact of HPV vaccination on HIV is unknown. We modeled the health impact of HPV vaccination in the context of the HIV epidemiology in Kenya.

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Background: HPV infection is the primary cause of cervical cancer, a leading cause of cancer among women in Kenya and many sub-Saharan African countries. High coverage of HPV vaccination is a World Health Organization priority to eliminate cervical cancer globally, but vaccine supply and logistics limit widespread implementation of the current two or three dose HPV vaccine schedule.

Methods: We are conducting an individual randomized controlled trial to evaluate whether a single dose of the bivalent (HPV 16/18) or nonavalent (HPV 16/18/31/33/45/52/58/6/11) HPV vaccine prevents persistent HPV infection, a surrogate marker for precancerous lesions and cervical cancer.

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Background: Existing social relationships are a potential source of "social capital" that can enhance support for sustained retention in HIV care. A previous pilot study of a social network-based 'microclinic' intervention, including group health education and facilitated HIV status disclosure, reduced disengagement from HIV care. We conducted a pragmatic randomized trial to evaluate microclinic effectiveness.

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Background: Female positive/male negative HIV-serodiscordant couples express a desire for children and may engage in condomless sex to become pregnant. Current guidelines recommend antiretroviral treatment in HIV-serodiscordant couples, yet HIV RNA viral suppression may not be routinely assessed or guaranteed and pre-exposure prophylaxis may not be readily available. Therefore, options for becoming pregnant while limiting HIV transmission should be offered and accessible to HIV-affected couples desiring children.

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Safer conception strategies can prevent HIV transmission between HIV-discordant partners while allowing them to conceive. However, HIV care providers in sub-Saharan Africa report they are not trained in safer conception, and patients are not routinely offered safer conception services. This mixed-methods pilot study evaluated the impact, acceptability, and feasibility of a novel Safer Conception Counseling Toolkit among providers and patients in Kenya.

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HIV treatment is life-long, yet many patients travel or migrate for their livelihoods, risking treatment interruption. We examine timely reengagement in care among patients who transferred-out or were lost-to-follow-up (LTFU) from a rural HIV facility. We conducted a cohort study among 369 adult patients on antiretroviral therapy between November 2011 and November 2013 on Mfangano Island, Kenya.

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Reproduction is important to many HIV-affected individuals and couples and healthcare providers (HCPs) are responsible for providing resources to help them safely conceive while minimizing the risk of sexual and perinatal HIV transmission. In order to fulfill their reproductive goals, HIV-affected individuals and their partners need access to information regarding safer methods of conception. The objective of this qualitative study was to develop a Safer Conception Counseling Toolkit that can be used to train HCPs and counsel HIV-affected individuals and couples in HIV care and treatment clinics in Kenya.

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Introduction: As efforts are made to reach universal access to ART in Kenya, the problem of congestion at HIV care clinics is likely to worsen. We evaluated the feasibility and the economic benefits of a designated time appointment system as a solution to decongest HIV care clinics.

Methods: This was an explanatory two-arm open-label randomized controlled trial that enrolled 354 consenting participants during their normal clinic days and followed-up at subsequent clinic appointments for up to nine months.

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Introduction: Safer conception strategies (SCS) have the potential to decrease HIV transmission among HIV-discordant couples who desire children. Community perceptions of SCS may influence the scale-up and uptake of these services, but little is known about how communities will react to these strategies. Without community support for SCS, their success as an HIV prevention tool may be limited.

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Since the discovery of HIV, the advent of anti-retrovirals in the late 80s heralded an era of medicalization of HIV and fostered major advancements in the management of the disease. Africa, despite its high HIV burden, lagged behind in the adoption of these advancements due to major resource and logistical constraints. Innovative responses such as family-centered models of care, community systems strengthening, integration of HIV care with existing health services, and economic and mobile phone- based approaches have been critical in the successful roll-out of evidence-based HIV/AIDS treatment even in the most resource- limited settings.

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Background: Despite progress in the global scale-up of antiretroviral therapy, sustained engagement in HIV care remains challenging. Social capital is an important factor for sustained engagement, but interventions designed to harness this powerful social force are uncommon.

Methods: We conducted a quasiexperimental study evaluating the impact of the Microclinic Social Network intervention on engagement in HIV care and medication adherence on Mfangano Island, Kenya.

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Cervical cancer is a leading cause of cancer-related death amongst women in sub-Saharan Africa, largely due to the lack of early screening and treatment. In addition to poor access to screening services, inadequate uptake of available services is a barrier to early identification of precancerous lesions. Given that cervical cancer is caused by a sexually transmitted virus and is associated with HIV positivity, stigma is one of the potential barriers to the utilization of cervical cancer programs in sub-Saharan Africa.

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Objective: Cervical cancer screening uptake may be influenced by inadequate knowledge in resource-limited settings. This randomized trial evaluated a health talk's impact on cervical cancer knowledge, attitudes, and screening rates in rural Kenya.

Methods: 419 women attending government clinics were randomized to an intervention (N=207) or control (N=212) group.

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Although cervical cancer is highly preventable through screening, it remains the number one cause of cancer-related death in Kenyan women due to lack of funding and infrastructure for prevention programs. In 2012, Family AIDS Care and Education Services in partnership with the Kenya Ministry of Health began offering free screening at eleven rural health facilities. We sought to explore why screening coverage remains low at some sites.

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Cervical cancer is a highly preventable disease that disproportionately affects women in developing countries and women with HIV. As integrated HIV and cervical cancer screening programs in Sub-Saharan Africa mature, we have an opportunity to measure the impact of outreach and education efforts and identify areas for future improvement. We conducted a cross-sectional survey of 106 women enrolled in care at an integrated HIV clinic in the Nyanza Province of Kenya 5 years after the start of a cervical cancer screening program.

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Objective: To evaluate cervical cancer knowledge, risk perception, and screening intention among women attending outpatient clinics in rural Kenya.

Methods: A cross-sectional oral survey was conducted among non-pregnant women aged 23-64 years who attended one of 11 western Kenyan health facilities for any reason between March 25 and April 26, 2013. Demographic and clinical predictors were identified using bivariate and multivariate regression analyses.

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