
Professor
M_Epidemiology & Biostatistics
+1 415 476-5781
My research interests are the epidemiology and prevention of infectious and tropical diseases of public health importance, both internationally and domestically, with a primary focus on HIV and AIDS. My work is funded primarily by the Centers for Disease Control and Prevention through the Presidential Emergency Plan for AIDS Relief. I also have smaller projects dealing with the epidemiology of tuberculosis in California, the prevention of childhood injury, immunizations and bioterrorism. I am a member of the AIDS Research Institute's Executive Committee.
Publications
Syndemic Factors Associated with Zika Virus Infection Prevalence and Risk Factors in a Cohort of Women Living in Endemic Areas for Arboviruses in Northeast Brazil.
Tropical medicine and infectious disease
Comparing frequency of booster vaccination to prevent severe COVID-19 by risk group in the United States.
Frontiers in medicine
Programmatic Implications of National Recent HIV Infection Surveillance in Cambodia.
The Journal of antimicrobial chemotherapy
The epidemiology of HIV population viral load in twelve sub-Saharan African countries.
Research Square
Identifying pauci-/asymptomatic and unrecognized Ebola virus disease among close contacts based on exposure risk assessments and screening algorithms.
The Journal of antimicrobial chemotherapy
Incidence and prevalence of COVID-19 within a healthcare worker cohort during the first year of the SARS-CoV-2 pandemic.
The American journal of tropical medicine and hygiene
Magnitude and determinants of SARS-CoV-2 household transmission: a longitudinal cohort study.
The American journal of tropical medicine and hygiene
All-cause and cause-specific mortality rates for Kisumu County: a comparison with Kenya, low-and middle-income countries.
PLOS global public health
Clinical sequelae among individuals with pauci-symptomatic or asymptomatic Ebola virus infection and unrecognised Ebola virus disease in Liberia: a longitudinal cohort study.
Essential Strategies for Leveraging AI in the Global HIV Response
Unusual Interseasonal RSV Activity in the Southern and Northern Hemispheres.
The Journal of antimicrobial chemotherapy
Interventions to reengage people living with HIV who are lost to follow-up from HIV treatment programs: A systematic review and meta-analysis.
M_MED-ZSFG-AIDS
Risk factor targeting for vaccine prioritization during the COVID-19 pandemic.
The Lancet. Microbe
Immunogenicity of rVSV?G-ZEBOV-GP Ebola vaccination in exposed and potentially exposed persons in the Democratic Republic of the Congo.
Journal of immigrant and minority health
Safe reopening of college campuses during COVID-19: The University of California experience in Fall 2020.
Research Square
Migration in Namibia and its association with HIV acquisition and treatment outcomes.
Research Square
Clarification regarding Outdoor Transmission of SARS-CoV-2 and Other Respiratory Viruses, a Systematic Review.
The Journal of antimicrobial chemotherapy
High HIV prevalence among decedents received by two high-volume mortuaries in Kisumu, western Kenya, 2019.
Research Square
Co-infection, SARS-CoV-2 and influenza: an evolving puzzle.
The American journal of tropical medicine and hygiene
Lowering SARS-CoV-2 viral load might affect transmission but not disease severity in secondary cases - Authors' reply.
Essential Strategies for Leveraging AI in the Global HIV Response
Routine asymptomatic testing strategies for airline travel during the COVID-19 pandemic: a simulation study.
Essential Strategies for Leveraging AI in the Global HIV Response
Outdoor Transmission of SARS-CoV-2 and Other Respiratory Viruses, a Systematic Review.
The Journal of antimicrobial chemotherapy
Importance of non-pharmaceutical interventions in lowering the viral inoculum to reduce susceptibility to infection by SARS-CoV-2 and potentially disease severity.
Essential Strategies for Leveraging AI in the Global HIV Response
The impact of different types of violence on Ebola virus disease transmission during the 2018-2020 outbreak in the Democratic Republic of the Congo.
The Journal of antimicrobial chemotherapy
Facial Masking for Covid-19. Reply.
M_MED-CORE-PULM
Political prioritization and the competing definitions of adolescent pregnancy in Kenya: An application of the Public Arenas Model.
Research Square
HIV Care Continuum and Meeting 90-90-90 Targets: Cascade of Care Analyses of a U.S. Military Cohort.
Will Coronavirus Disease 2019 Become Seasonal?
The Journal of antimicrobial chemotherapy
Brief Report: Recent HIV Infection Surveillance in Routine HIV Testing in Nairobi, Kenya: A Feasibility Study.
PLoS pathogens
Service delivery interventions to increase uptake of voluntary medical male circumcision for HIV prevention: A systematic review.
Research Square
Challenges to generating political prioritization for adolescent sexual and reproductive health in Kenya: A qualitative study.
Research Square
Neurological, Cognitive, and Psychological Findings Among Survivors of Ebola Virus Disease From the 1995 Ebola Outbreak in Kikwit, Democratic Republic of Congo: A Cross-sectional Study.
The American journal of tropical medicine and hygiene
Projections of Ebola outbreak size and duration with and without vaccine use in Équateur, Democratic Republic of Congo, as of May 27, 2018.
Research Square
Supportive interventions to improve retention on ART in people with HIV in low- and middle-income countries: A systematic review.
Research Square
Linking private, for-profit providers to public sector services for HIV and tuberculosis co-infected patients: A systematic review.
Research Square
Anatomy of a Hotspot: Chain and Seroepidemiology of Ebola Virus Transmission, Sukudu, Sierra Leone, 2015-16.
The Journal of antimicrobial chemotherapy
Effect of park prescriptions with and without group visits to parks on stress reduction in low-income parents: SHINE randomized trial.
Research Square
HIV and hepatitis B and C co-infection among people who inject drugs in Zanzibar.
PLOS global public health
Is 90-90-90 achievable?
Communications medicine
Evaluating Google Flu Trends in Latin America: Important Lessons for the Next Phase of Digital Disease Detection.
The American journal of tropical medicine and hygiene
Cefazolin versus Nafcillin for Methicillin-Sensitive Staphylococcus aureus Bloodstream Infection in a California Tertiary Medical Center.
AIDS patient care and STDs
Evaluation of Kenya's readiness to transition from sentinel surveillance to routine HIV testing for antenatal clinic-based HIV surveillance.
H-Center for TB
Slowing of the HIV epidemic in Ukraine: evidence from case reporting and key population surveys, 2005-2012.
Research Square
Kenya AIDS Indicator Survey 2012.
PLoS pathogens
Kenya AIDS Indicator Surveys 2007 and 2012: implications for public health policies for HIV prevention and treatment.
PLoS pathogens
Mother-to-child transmission of HIV in Kenya: results from a nationally representative study.
PLoS pathogens
Status of voluntary medical male circumcision in Kenya: findings from 2 nationally representative surveys in Kenya, 2007 and 2012.
PLoS pathogens
Early initiation of antiretroviral therapy in HIV-infected adults and adolescents: a systematic review.
The Lancet regional health. Southeast Asia
Improving antiretroviral therapy scale-up and effectiveness through service integration and decentralization.
The Lancet regional health. Southeast Asia
Predicting treatment failure in adults and children on antiretroviral therapy: a systematic review of the performance characteristics of the 2010 WHO immunologic and clinical criteria for virologic failure.
The Lancet regional health. Southeast Asia
HIV among MSM in a large middle-income country.
The Lancet regional health. Southeast Asia
HIV pre-exposure prophylaxis.
Tropical medicine and infectious disease
Acquisition of GB virus type C and lower mortality in patients with advanced HIV disease.
The American journal of tropical medicine and hygiene
Antiretroviral therapy and the prevention of sexually transmitted HIV infection.
Tropical medicine and infectious disease
Antiretroviral drug resistance in a respondent-driven sample of HIV-infected men who have sex with men in Brazil.
PLoS pathogens
Human herpesvirus 8 infection in children and adults in a population-based study in rural Uganda.
The Journal of antimicrobial chemotherapy
Depression and HIV in Botswana: a population-based study on gender-specific socioeconomic and behavioral correlates.
Research Square
Public health triangulation: approach and application to synthesizing data to understand national and local HIV epidemics.
PLOS global public health
The role of breast-feeding in the prevention of Helicobacter pylori infection: a systematic review.
The American journal of tropical medicine and hygiene
Condoms in concentrated and generalised HIV epidemics.
M_PEDS-INFECTIOUS DISEASE
The efficacy of behavioral interventions in reducing HIV risk behaviors and incident sexually transmitted diseases in heterosexual African Americans.
The Lancet regional health. Southeast Asia
The effect of HIV on morbidity and mortality in children with severe malarial anaemia.
African Journal of Thoracic and Critical Care Medicine
Estimating severe coccidioidomycosis in California.
Journal of general internal medicine
Prevalence, incidence and mortality associated with tuberculosis in HIV-infected patients initiating antiretroviral therapy in rural Uganda.
The Lancet regional health. Southeast Asia
Thyroid function and perchlorate in drinking water: an evaluation among California newborns, 1998.
H_PPH-Domestic-TB
The role of BCG in prevention of leprosy: a meta-analysis.
Essential Strategies for Leveraging AI in the Global HIV Response
Changes in sexual behavior and risk of HIV transmission after antiretroviral therapy and prevention interventions in rural Uganda.
The Lancet regional health. Southeast Asia
Pediatric acute lung injury: prospective evaluation of risk factors associated with mortality.
member
Risks of serious complications and death from smallpox vaccination: a systematic review of the United States experience, 1963-1968.
PLOS global public health
Emerging HIV-1 epidemic in China in men who have sex with men.
M_PEDS-INFECTIOUS DISEASE
Risk factors for incident HIV infection among anonymous HIV testing site clients in Santos, Brazil: 1996-1999.
PLoS pathogens
Nonoxynol-9 spermicide for prevention of vaginally acquired HIV and other sexually transmitted infections: systematic review and meta-analysis of randomised controlled trials including more than 5000 women.
Essential Strategies for Leveraging AI in the Global HIV Response
International collaboration in conducting systematic reviews: the Cochrane Collaborative Review Group on HIV Infection and AIDS.
PLoS pathogens
Nonoxynol-9 for preventing vaginal acquisition of sexually transmitted infections by women from men.
Truck drivers in Brazil: prevalence of HIV and other sexually transmitted diseases, risk behavior and potential for spread of infection.
The Lancet regional health. Southeast Asia
Risk factors for injuries from in-line skating and the effectiveness of safety gear.
M_MED-CORE-PULM
Determinants of survival in adult Brazilian AIDS patients, 1982-1989. The Brazilian State AIDS Program Co-Ordinators.
The Lancet regional health. Southeast Asia
Progression and clinical outcome of infection due to human immunodeficiency virus.
The American journal of tropical medicine and hygiene
The draft lottery and AIDS: evidence against increased intravenous drug use by Vietnam-era veterans.
Course of HIV-I infection in a cohort of homosexual and bisexual men: an 11 year follow up study.
Tropical medicine and infectious disease
The role of human immunodeficiency virus infection in pneumococcal bacteremia in San Francisco residents.
The Journal of antimicrobial chemotherapy
Human immunodeficiency virus infection in tuberculosis patients.
The Journal of antimicrobial chemotherapy
Effect of the revised AIDS case definition on AIDS reporting in San Francisco: evidence of increased reporting in intravenous drug users.
The Lancet regional health. Southeast Asia
Detection of human immunodeficiency virus DNA using the polymerase chain reaction in a well-characterized group of homosexual and bisexual men.
The Journal of antimicrobial chemotherapy
The epidemiology of AIDS-related Kaposi's sarcoma in San Francisco.
The Journal of antimicrobial chemotherapy
Evaluation of AIDS prevention and control programs.
The Lancet regional health. Southeast Asia
Use of hospitals by patients with AIDS in San Francisco.
M_MED-CORE-PULM
The epidemiology of AIDS in Asian and Pacific Islander populations in San Francisco.
The Lancet regional health. Southeast Asia
The natural history of human immunodeficiency virus infection.
The Journal of antimicrobial chemotherapy
Estimating AIDS infection rates in the San Francisco cohort.
The Lancet regional health. Southeast Asia
Survival patterns of the first 500 patients with AIDS in San Francisco.
The Journal of antimicrobial chemotherapy
Declining prevalence of Kaposi's sarcoma in homosexual AIDS patients paralleled by fall in cytomegalovirus transmission.
M_PEDS-INFECTIOUS DISEASE
Incidence of salmonellosis in patients with AIDS.
The Journal of antimicrobial chemotherapy
Outbreak of paralytic poliomyelitis, Taiwan.
M_PEDS-INFECTIOUS DISEASE