Olivia Keiser
Biographic Data
| ID | 7047317 |
|---|---|
| NAME | Olivia Keiser |
| GIVEN NAMES | Olivia |
| FAMILY NAME | Keiser |
| SIGNATURE | KEISER O |
| AFFILIATIONS | University of Geneva |
| ORCID | 0000-0001-8191-2789 |
| VERIFIED | Yes |
| TOTAL WORKS | 23 |
| TOTAL CITATIONS | 0 |
| AUTHOR COUNT | 23 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2011 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 0 |
Impact of the 2013 WHO guidelines for screening and treatment of cervical pre-cancerous lesions on women’s screening uptake, by HIV-status, in Eastern and Southern Africa
The 2013 World Health Organization (WHO) guidelines for cervical pre-cancer screening recommended screening women aged 30–49 and women living with HIV (WLHIV) starting at age 25. However, the impact of the guidelines and the age to start screening on screening uptake has not been studied. We used a regression discontinuity design analysis of population-based data to assess the impact of the guidelines on the screening rates for women according to…
Living in Fear
Dedicated studies to understand and explore HIV-related stigma among PWH in Senegal are essential for the development and implementation of effective stigma reduction strategies. The goals of this study were to understand the current challenges confronted by newly diagnosed PWH in Senegal and to explore the manifestations of HIV-related stigma using a mixed methods approach. We conducted a convergent mixed methods study among participants ≥ 18 ye…
Oral PrEP continuation rates among key populations in Nigeria
INTRODUCTION: Pre-exposure prophylaxis (PrEP) is an effective HIV prevention strategy, but its impact is limited by low uptake and poor continuation rates. This study investigates oral PrEP continuation among key populations (KPs) enrolled in an HIV prevention programme across seven states in Nigeria, representing one of the largest longitudinal PrEP continuation studies in Sub-Saharan Africa to date. METHODS: We analysed data from 43 788 clients…
Determinants of Nurturing Care Behaviours in Malawi
In Malawi, 38% of children under five are stunted, and only 36% are developmentally on track. An ethnographic study using the Reality Check Approach was conducted in four villages in Ntcheu and Balaka districts in Malawi to understand caregiving-related drivers of malnutrition and poor child development. Researchers immersed themselves in 12 rural households with a pregnant woman or a child under 2 years for 4 days and nights, and gathered inform…
Perceptions and management of diabetes and obesity among people living with HIV in Côte d’Ivoire
These results highlight the complexity surrounding the perceptions and management of T2DM and obesity among PLHIV in Abidjan, Côte d'Ivoire. In order to implement innovative and efficient intervention strategies to prevent and treat these metabolic conditions, cultural beliefs as well as socio-economic barriers must be addressed
Missing the vulnerable—Inequalities in social protection in 13 sub-Saharan African countries
We assessed socioeconomic inequalities in social protection coverage among the public, men and women living with the human immunodeficiency virus (MLHIV, WLHIV), and adolescent girls and young women (AGYW). We used population-based data from Cameroon, Côte d’Ivoire, Ethiopia, Eswatini, Kenya, Lesotho, Malawi, Namibia, Rwanda, Tanzania, Uganda, Zambia, and Zimbabwe. We constructed concentration curves (CC) and computed concentration indices (CIX) …
A community-based contact isolation strategy to reduce the spread of Ebola virus disease
INTRODUCTION: Despite tremendous progress in the development of diagnostics, vaccines and therapeutics for Ebola virus disease (EVD), challenges remain in the implementation of holistic strategies to rapidly curtail outbreaks. We investigated the effectiveness of a community-based contact isolation strategy to limit the spread of the disease in the Democratic Republic of Congo (DRC). METHODS: We did a quasi-experimental comparison study. Eligible…
Investing in preparedness for rapid detection and control of epidemics
The 2014–2016 West Africa Ebola Virus Disease (EVD) Epidemic devastated Guinea’s health system and constituted a public health emergency of international concern. Following the crisis, Guinea invested in the establishment of basic health system reforms and crucial legal instruments for strengthening national health security in line with the WHO’s recommendations for ensuring better preparedness for (and, therefore, a response to) health emergenci…
Historical visit attendance as predictor of treatment interruption in South African HIV patients
Retention of antiretroviral (ART) patients is a priority for achieving HIV epidemic control in South Africa. While machine-learning methods are being increasingly utilised to identify high risk populations for suboptimal HIV service utilisation, they are limited in terms of explaining relationships between predictors. To further understand these relationships, we implemented machine learning methods optimised for predictive power and traditional …
Covid-19 preventive social-behavioural practices and exposure to Sars-CoV-2 among residents in the city of Yaounde
Non-pharmaceutical interventions remain key in mitigating the spread of SARS-CoV-2. We sought to assess COVID-19 preventive, social-behavioural practices, and SARS-CoV-2 exposure through IgG rapid tests. This was a cross-sectional survey among 971 respondents residing in 180 households within the “ Cite Verte ” health district of Yaounde-Cameroon, from October-November 2020. Using a structured questionnaire, data on SARS-CoV-2 preventive and soci…
Differences between persons with and without disability in HIV prevalence, testing, treatment, and care cascade in Tanzania
We found no significant differences in the odds of having HIV and of accessing ART between persons with and without disability in Tanzania. While PLHIV and disability, were often aware of their HIV-positive status than their non-disabled counterparts, men living with HIV and with disability may have been disadvantaged in having suppressed HIV viral loads. These differences are correctable with disability-inclusive HIV programming. HIV surveys aro…
A call for citizen science in pandemic preparedness and response
The COVID-19 pandemic has underlined the need to partner with the community in pandemic preparedness and response in order to enable trust-building among stakeholders, which is key in pandemic management. Citizen science, defined here as a practice of public participation and collaboration in all aspects of scientific research to increase knowledge and build trust with governments and researchers, is a crucial approach to promoting community enga…
Covid-19 pandemic in Africa’s island nations during the first 9 months
The geographic and economic characteristics unique to island nations create a different set of conditions for, and responses to, the spread of a pandemic compared with those of mainland countries. Here, we aimed to describe the initial period of the COVID-19 pandemic, along with the potential conditions and responses affecting variation in the burden of infections and severe disease burden, across the six island nations of the WHO’s Africa region…
An in-depth statistical analysis of the Covid-19 pandemic’s initial spread in the WHO African region
During the first wave of the COVID-19 pandemic, sub-Saharan African countries experienced comparatively lower rates of SARS-CoV-2 infections and related deaths than in other parts of the world, the reasons for which remain unclear. Yet, there was also considerable variation between countries. Here, we explored potential drivers of this variation among 46 of the 47 WHO African region Member States in a cross-sectional study. We described five indi…
Access to Social Protection by People Living with, at Risk of, or Affected by HIV in Eswatini, Malawi, Tanzania, and Zambia
We aimed to measure social protection coverage among the general population, women and men living with HIV (WLHIV, MLHV), female and male sex workers (FSW, MSW), men who have sex with men (MSM), adolescent girls young women (AGYW), and orphans vulnerable children (OVC) in Eswatini, Malawi, Tanzania, and Zambia. We used Population-Based HIV Impact Assessment data. We operationalised social protection benefits as external economic support from priv…
Facing the quality of life
0.011), and two-fold (aOR 1.97 95% CI 1.31-2.94) more likely to report depression symptoms than HIV negative peers. Food insecurity and disability among PLHIV may worsen their physical illnesses, anxiety, depression symptoms, and other QoL domains. More research on the quality of life of PLHIV in poverty is required
Women with disabilities in hearing
This article explored the differences in HIV testing in the elimination of mother-to-child transmission of HIV (EMTCT) between women with and without disabilities aged 16-55 years, reported being pregnant and receiving the social cash transfers (SCT) social safety nets in Luapula province, Zambia. We tested for associations between HIV testing in EMTCT and disability using logistic regression analyses. We calculated a functional score for each wo…
Leveraging human resources for outbreak analysis
Emerging infectious diseases are a growing threat in sub-Saharan African countries, but the human and technical capacity to quickly respond to outbreaks remains limited. Here, we describe the experience and lessons learned from a joint project with the WHO Regional Office for Africa (WHO AFRO) to support the sub-Saharan African COVID-19 response.In June 2020, WHO AFRO contracted a number of consultants to reinforce the COVID-19 response in member…
Covid-19 mortality in women and men in sub-Saharan Africa
INTRODUCTION: Since sex-based biological and gender factors influence COVID-19 mortality, we wanted to investigate the difference in mortality rates between women and men in sub-Saharan Africa (SSA). METHOD: We included 69 580 cases of COVID-19, stratified by sex (men: n=43 071; women: n=26 509) and age (0-39 years: n=41 682; 40-59 years: n=20 757; 60+ years: n=7141), from 20 member nations of the WHO African region until 1 September 2020. We com…
Social determinants of male partner attendance in women’s prevention-of mother-to-child transmission program in Malawi
Our study shows a high male attendance in Malawi compared to other studies performed in SSA. This study highlights that women's level of knowledge on HIV and their economic condition (employment and owning a means of transport) affects male attendance. Moreover, the study points out that gender power relationships and stringent gender norms play a crucial role thus they should be considered to enhance male involvement
Precision Global Health – The case of Ebola
BACKGROUND: The 2014-2016 Ebola outbreak across West Africa was devastating, acting not only as a wake-up call for the global health community, but also as a catalyst for innovative change and global action. Improved infectious disease monitoring is the stepping-stone toward better disease prevention and control efforts, and recent research has revealed the potential of digital technologies to transform the field of global health. This scoping re…
Retention in care under universal antiretroviral therapy for HIV-infected pregnant and breastfeeding women (‘Option B+’) in Malawi
OBJECTIVE: To explore the levels and determinants of loss to follow-up (LTF) under universal lifelong antiretroviral therapy (ART) for pregnant and breastfeeding women ('Option B+') in Malawi. DESIGN, SETTING, AND PARTICIPANTS: We examined retention in care, from the date of ART initiation up to 6 months, for women in the Option B+ program. We analysed nationwide facility-level data on women who started ART at 540 facilities (n = 21,939), as well…
Outcomes of Antiretroviral Therapy in the Swiss HIV Cohort Study
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Outcomes of Antiretroviral Therapy in the Swiss HIV Cohort Study
Retention in care under universal antiretroviral therapy for HIV-infected pregnant and breastfeeding women (‘Option B+’) in Malawi
OBJECTIVE: To explore the levels and determinants of loss to follow-up (LTF) under universal lifelong antiretroviral therapy (ART) for pregnant and breastfeeding women ('Option B+') in Malawi. DESIGN, SETTING, AND PARTICIPANTS: We examined retention in care, from the date of ART initiation up to 6 months, for women in the Option B+ program. We analysed nationwide facility-level data on women who started ART at 540 facilities (n = 21,939), as well…
Precision Global Health – The case of Ebola
BACKGROUND: The 2014-2016 Ebola outbreak across West Africa was devastating, acting not only as a wake-up call for the global health community, but also as a catalyst for innovative change and global action. Improved infectious disease monitoring is the stepping-stone toward better disease prevention and control efforts, and recent research has revealed the potential of digital technologies to transform the field of global health. This scoping re…
Social determinants of male partner attendance in women’s prevention-of mother-to-child transmission program in Malawi
Our study shows a high male attendance in Malawi compared to other studies performed in SSA. This study highlights that women's level of knowledge on HIV and their economic condition (employment and owning a means of transport) affects male attendance. Moreover, the study points out that gender power relationships and stringent gender norms play a crucial role thus they should be considered to enhance male involvement
Covid-19 mortality in women and men in sub-Saharan Africa
INTRODUCTION: Since sex-based biological and gender factors influence COVID-19 mortality, we wanted to investigate the difference in mortality rates between women and men in sub-Saharan Africa (SSA). METHOD: We included 69 580 cases of COVID-19, stratified by sex (men: n=43 071; women: n=26 509) and age (0-39 years: n=41 682; 40-59 years: n=20 757; 60+ years: n=7141), from 20 member nations of the WHO African region until 1 September 2020. We com…
A call for citizen science in pandemic preparedness and response
The COVID-19 pandemic has underlined the need to partner with the community in pandemic preparedness and response in order to enable trust-building among stakeholders, which is key in pandemic management. Citizen science, defined here as a practice of public participation and collaboration in all aspects of scientific research to increase knowledge and build trust with governments and researchers, is a crucial approach to promoting community enga…
Covid-19 pandemic in Africa’s island nations during the first 9 months
The geographic and economic characteristics unique to island nations create a different set of conditions for, and responses to, the spread of a pandemic compared with those of mainland countries. Here, we aimed to describe the initial period of the COVID-19 pandemic, along with the potential conditions and responses affecting variation in the burden of infections and severe disease burden, across the six island nations of the WHO’s Africa region…
An in-depth statistical analysis of the Covid-19 pandemic’s initial spread in the WHO African region
During the first wave of the COVID-19 pandemic, sub-Saharan African countries experienced comparatively lower rates of SARS-CoV-2 infections and related deaths than in other parts of the world, the reasons for which remain unclear. Yet, there was also considerable variation between countries. Here, we explored potential drivers of this variation among 46 of the 47 WHO African region Member States in a cross-sectional study. We described five indi…
Access to Social Protection by People Living with, at Risk of, or Affected by HIV in Eswatini, Malawi, Tanzania, and Zambia
We aimed to measure social protection coverage among the general population, women and men living with HIV (WLHIV, MLHV), female and male sex workers (FSW, MSW), men who have sex with men (MSM), adolescent girls young women (AGYW), and orphans vulnerable children (OVC) in Eswatini, Malawi, Tanzania, and Zambia. We used Population-Based HIV Impact Assessment data. We operationalised social protection benefits as external economic support from priv…
Facing the quality of life
0.011), and two-fold (aOR 1.97 95% CI 1.31-2.94) more likely to report depression symptoms than HIV negative peers. Food insecurity and disability among PLHIV may worsen their physical illnesses, anxiety, depression symptoms, and other QoL domains. More research on the quality of life of PLHIV in poverty is required
Women with disabilities in hearing
This article explored the differences in HIV testing in the elimination of mother-to-child transmission of HIV (EMTCT) between women with and without disabilities aged 16-55 years, reported being pregnant and receiving the social cash transfers (SCT) social safety nets in Luapula province, Zambia. We tested for associations between HIV testing in EMTCT and disability using logistic regression analyses. We calculated a functional score for each wo…
Leveraging human resources for outbreak analysis
Emerging infectious diseases are a growing threat in sub-Saharan African countries, but the human and technical capacity to quickly respond to outbreaks remains limited. Here, we describe the experience and lessons learned from a joint project with the WHO Regional Office for Africa (WHO AFRO) to support the sub-Saharan African COVID-19 response.In June 2020, WHO AFRO contracted a number of consultants to reinforce the COVID-19 response in member…
A community-based contact isolation strategy to reduce the spread of Ebola virus disease
INTRODUCTION: Despite tremendous progress in the development of diagnostics, vaccines and therapeutics for Ebola virus disease (EVD), challenges remain in the implementation of holistic strategies to rapidly curtail outbreaks. We investigated the effectiveness of a community-based contact isolation strategy to limit the spread of the disease in the Democratic Republic of Congo (DRC). METHODS: We did a quasi-experimental comparison study. Eligible…
Investing in preparedness for rapid detection and control of epidemics
The 2014–2016 West Africa Ebola Virus Disease (EVD) Epidemic devastated Guinea’s health system and constituted a public health emergency of international concern. Following the crisis, Guinea invested in the establishment of basic health system reforms and crucial legal instruments for strengthening national health security in line with the WHO’s recommendations for ensuring better preparedness for (and, therefore, a response to) health emergenci…
Historical visit attendance as predictor of treatment interruption in South African HIV patients
Retention of antiretroviral (ART) patients is a priority for achieving HIV epidemic control in South Africa. While machine-learning methods are being increasingly utilised to identify high risk populations for suboptimal HIV service utilisation, they are limited in terms of explaining relationships between predictors. To further understand these relationships, we implemented machine learning methods optimised for predictive power and traditional …
Covid-19 preventive social-behavioural practices and exposure to Sars-CoV-2 among residents in the city of Yaounde
Non-pharmaceutical interventions remain key in mitigating the spread of SARS-CoV-2. We sought to assess COVID-19 preventive, social-behavioural practices, and SARS-CoV-2 exposure through IgG rapid tests. This was a cross-sectional survey among 971 respondents residing in 180 households within the “ Cite Verte ” health district of Yaounde-Cameroon, from October-November 2020. Using a structured questionnaire, data on SARS-CoV-2 preventive and soci…
Differences between persons with and without disability in HIV prevalence, testing, treatment, and care cascade in Tanzania
We found no significant differences in the odds of having HIV and of accessing ART between persons with and without disability in Tanzania. While PLHIV and disability, were often aware of their HIV-positive status than their non-disabled counterparts, men living with HIV and with disability may have been disadvantaged in having suppressed HIV viral loads. These differences are correctable with disability-inclusive HIV programming. HIV surveys aro…
Missing the vulnerable—Inequalities in social protection in 13 sub-Saharan African countries
We assessed socioeconomic inequalities in social protection coverage among the public, men and women living with the human immunodeficiency virus (MLHIV, WLHIV), and adolescent girls and young women (AGYW). We used population-based data from Cameroon, Côte d’Ivoire, Ethiopia, Eswatini, Kenya, Lesotho, Malawi, Namibia, Rwanda, Tanzania, Uganda, Zambia, and Zimbabwe. We constructed concentration curves (CC) and computed concentration indices (CIX) …
Oral PrEP continuation rates among key populations in Nigeria
INTRODUCTION: Pre-exposure prophylaxis (PrEP) is an effective HIV prevention strategy, but its impact is limited by low uptake and poor continuation rates. This study investigates oral PrEP continuation among key populations (KPs) enrolled in an HIV prevention programme across seven states in Nigeria, representing one of the largest longitudinal PrEP continuation studies in Sub-Saharan Africa to date. METHODS: We analysed data from 43 788 clients…
Determinants of Nurturing Care Behaviours in Malawi
In Malawi, 38% of children under five are stunted, and only 36% are developmentally on track. An ethnographic study using the Reality Check Approach was conducted in four villages in Ntcheu and Balaka districts in Malawi to understand caregiving-related drivers of malnutrition and poor child development. Researchers immersed themselves in 12 rural households with a pregnant woman or a child under 2 years for 4 days and nights, and gathered inform…
Perceptions and management of diabetes and obesity among people living with HIV in Côte d’Ivoire
These results highlight the complexity surrounding the perceptions and management of T2DM and obesity among PLHIV in Abidjan, Côte d'Ivoire. In order to implement innovative and efficient intervention strategies to prevent and treat these metabolic conditions, cultural beliefs as well as socio-economic barriers must be addressed
Impact of the 2013 WHO guidelines for screening and treatment of cervical pre-cancerous lesions on women’s screening uptake, by HIV-status, in Eastern and Southern Africa
The 2013 World Health Organization (WHO) guidelines for cervical pre-cancer screening recommended screening women aged 30–49 and women living with HIV (WLHIV) starting at age 25. However, the impact of the guidelines and the age to start screening on screening uptake has not been studied. We used a regression discontinuity design analysis of population-based data to assess the impact of the guidelines on the screening rates for women according to…
Living in Fear
Dedicated studies to understand and explore HIV-related stigma among PWH in Senegal are essential for the development and implementation of effective stigma reduction strategies. The goals of this study were to understand the current challenges confronted by newly diagnosed PWH in Senegal and to explore the manifestations of HIV-related stigma using a mixed methods approach. We conducted a convergent mixed methods study among participants ≥ 18 ye…
Medicine (20 works) · Public health (12 works) · Demography (11 works) · Environmental health (11 works) · HIV/AIDS Research and Interventions (11 works) · Nursing (10 works) · Internal Medicine (8 works) · Cross-sectional study (6 works) · Disease (6 works) · Family medicine (6 works)