Udi Davidovich
Biographic Data
| ID | 4273426 |
|---|---|
| NAME | Udi Davidovich |
| GIVEN NAMES | Udi |
| FAMILY NAME | Davidovich |
| SIGNATURE | DAVIDOVICH U |
| AFFILIATIONS | GGD Amsterdam |
| ORCID | 0000-0002-4921-0346 |
| VERIFIED | Yes |
| TOTAL WORKS | 25 |
| TOTAL CITATIONS | 12 |
| AUTHOR COUNT | 25 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2000 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 3 |
Promoting HIV-Testing Amongst Gay, Bisexual and Other Men who have Sex with Men in Amsterdam
Late HIV diagnosis remains prevalent in gay, bisexual, and other men who have sex with men (GBMSM) in Amsterdam and is associated with ongoing transmission. Drawing on proven but underused intervention development approaches, we co-created an innovative communication campaign with GBMSM and HIV prevention experts to promote HIV-testing amongst never or not recently tested GBMSM. The campaign addressed behavioral determinants of HIV testing throug…
Intentions to use different modalities of long-acting HIV PrEP among men who have sex with men and transgender and gender diverse persons in the Netherlands
Insight into intentions to use long-acting HIV pre-exposure prophylaxis (PrEP) is essential for successful implementation. We assessed intention to use three hypothetical long-acting PrEP modalities (oral, intramuscular and subdermal) among HIV-negative men who have sex with men (MSM) and transgender and gender diverse persons in Amsterdam, recruited through the Amsterdam Cohort Studies (ACS-participants) and social media (survey-participants). I…
Understanding problematic versus non-problematic chemsex practices from a user's perspective
Chemsex is predominantly reported among men who have sex with men (MSM) and plays an important role in HIV transmission and prevention, being associated with heightened vulnerability to HIV and other sexually transmitted infections. While often used recreationally, chemsex is linked to physical and mental health harms. This study explores how participants define problematic chemsex and perceive contributing and protective factors. Semi-structured…
The power for action – now
Opportunities for improved indicator-based HIV testing in the hospital setting
Indicator condition (IC)-guided HIV testing, i.e., testing when diagnosing a condition associated with HIV, is a feasible and cost-effective testing strategy to identify undiagnosed individuals. Assessing determinants for IC-guided testing may identify opportunities for improvement. A survey study based on the Theory of Planned Behaviour (TPB) was conducted among 163 hospital physicians from five specialties in Amsterdam, the Netherlands. Structu…
Mpox vaccination willingness, determinants, and communication needs in gay, bisexual, and other men who have sex with men, in the context of limited vaccine availability in the Netherlands (Dutch Mpox…
Introduction: In the 2022 multicountry mpox (formerly named monkeypox) outbreak, several countries offered primary preventive vaccination (PPV) to people at higher risk for infection. We study vaccine acceptance and its determinants, to target and tailor public health (communication-) strategies in the context of limited vaccine supply in the Netherlands. Methods: Online survey in a convenience sample of gay, bisexual and other men who have sex w…
Changes in substance use among HIV-negative MSM
The Burden of Living With HIV is Mostly Overestimated by HIV-Negative and Never-Tested Men Who Have Sex With Men
Understanding Reasons for HIV Late Diagnosis
Since the introduction of effective anti-retroviral therapy, early diagnosis and treatment of HIV have become increasingly important from individual and public health perspectives. People who are diagnosed with a CD4 count below 350 cells/μL blood are today considered to be "late" diagnoses. In an effort to understand the reasons for late diagnosis, we conducted in-depth interviews (n = 14) in Amsterdam, the Netherlands. Two main factors were ide…
The Impact of Pre-exposure Prophylaxis on Sexual Well-Being Among Men Who Have Sex with Men
The social meanings of PrEP use - A mixed-method study of PrEP use disclosure in Antwerp and Amsterdam
Pre-Exposure Prophylaxis (PrEP) is a novel HIV prevention tool. PrEP stigma is a frequently reported barrier, while social disclosure of PrEP use may be an important facilitator. We explored how PrEP users managed PrEP use disclosure using a symbolic interactionist approach. We interviewed 32 participants from two PrEP demonstration projects (Be-PrEP-ared, Antwerp; AMPrEP, Amsterdam). We validated qualitative findings through Be-PrEP-ared questio…
Ability to Monitor National Responses to the HIV Epidemic “Beyond Viral Suppression”
Objective: With more PLHIV aging into their 50s and beyond in settings where antiretroviral therapy is widely available, non-AIDS comorbidities and health-related quality of life (HRQoL) are becoming major challenges. Information is needed about whether national HIV monitoring programmes have evolved to reflect the changing focus of HIV care. Methods: We created a 56-item English-language survey to assess whether health systems report on common h…
Aidsimpact 2019 special issue – Promises to keep and miles to go
The Rhythm of Risk
HIV risk perception plays a crucial role in the uptake of preventive strategies. We investigated how risk perception and its determinants changed between 1999 and 2018 in an open, prospective cohort of 1323 HIV-negative men who have sex with men (MSM). Risk perception, defined as the perceived likelihood of acquiring HIV in the past 6 months, changed over time: being relatively lower in 2008-2011, higher in 2012-2016, and again lower in 2017-2018…
Types of Group Sex and Their Association with Different Sexual Risk Behaviors Among HIV-Negative Men Who Have Sex with Men
What will it really take to end the HIV epidemic
International audience
Same-sex sexual attraction, behavior, and practices of Jewish men in Israel and the association with HIV prevalence
In order to efficiently direct efforts and resources required for the prevention of HIV and other sexually transmitted infection among men who have sex with men (MSM) in Israel, it is necessary to define their particular behaviors, estimate their size, and asses the HIV-burden. This cross-sectional study included a sub-sample from a random representative National study performed in Israel, which included Jewish males aged 18-44 who completed onli…
“We are our choices” – Aids impact special issue Amsterdam 2015
International audience
Sexual Orientation and Behavior of Adult Jews in Israel and the Association With Risk Behavior
High awareness of hepatitis C virus (HCV) but limited knowledge of HCV complications among HIV-positive and HIV-negative men who have sex with men
Hepatitis C virus (HCV) has emerged as a sexually transmitted infection among HIV-positive men who have sex with men (MSM) in high-income countries. Little is reported about HCV awareness among MSM, although this is essential for developing targeted prevention strategies. We, therefore, studied HCV awareness and knowledge among HIV-positive and HIV-negative MSM from the Amsterdam Cohort Studies (ACS). During two visits, 1 year apart and starting …
Undetectable Viral Load and the Decision to Engage in Unprotected Anal Intercourse Among HIV-Positive MSM
Serosorting and sexual risk behaviour according to different casual partnership types among MSM
Among HIV-negative men who have sex with men (MSM), any incident of unprotected anal intercourse (UAI) between casual partners is usually regarded as risky for HIV transmission. However, men are increasingly using knowledge of their casual partner's HIV-status to reduce HIV risk during UAI (i.e., serosorting). Since familiarity between casual partners may lead to higher levels of UAI and serosorting, we examined how often men have UAI and practic…
Reasons for compliance or noncompliance with advice to test for hepatitis C via an internet-mediated blood screening service
Features specific to the online service played a significant role in motivation to test for HCV above and beyond the more conventional perceived health benefits of HCV testing. However, some online specific features were considered problematic and need to be adapted. Methods and strategies for dealing with these impeding factors and for improving compliance with testing via the online service are outlined
Behavioral and Cognitive Barriers to Safer Sex Between Men in Steady Relationships
Steady partners are a major source of HIV infection among gay men. To better understand sexual risk taking in steady relationships, we examined characteristics of the first incident of unprotected anal intercourse (UAI) between steady male partners. We also examined cognitive barriers to safer sex by way of associating beliefs regarding UAI with protective behavior. Questionnaires assessing sexual behavior and related cognitions were completed by…
Assessing sexual risk behaviour of young gay men in primary relationships
OBJECTIVES: To establish the actual rate of risky unprotected anal intercourse (UAI) among young gay men in steady relationships by correcting for negotiated safety (NS) and NS compliance. In addition, to examine whether the rate of UAI with steady partners, after correction for NS and NS compliance, is higher than the rate of UAI during sexual contacts with casual partners. METHODS: A total of 435 young gay men completed questionnaires regarding…
The Impact of Pre-exposure Prophylaxis on Sexual Well-Being Among Men Who Have Sex with Men
Types of Group Sex and Their Association with Different Sexual Risk Behaviors Among HIV-Negative Men Who Have Sex with Men
Sexual Orientation and Behavior of Adult Jews in Israel and the Association With Risk Behavior
Assessing sexual risk behaviour of young gay men in primary relationships
OBJECTIVES: To establish the actual rate of risky unprotected anal intercourse (UAI) among young gay men in steady relationships by correcting for negotiated safety (NS) and NS compliance. In addition, to examine whether the rate of UAI with steady partners, after correction for NS and NS compliance, is higher than the rate of UAI during sexual contacts with casual partners. METHODS: A total of 435 young gay men completed questionnaires regarding…
Behavioral and Cognitive Barriers to Safer Sex Between Men in Steady Relationships
Steady partners are a major source of HIV infection among gay men. To better understand sexual risk taking in steady relationships, we examined characteristics of the first incident of unprotected anal intercourse (UAI) between steady male partners. We also examined cognitive barriers to safer sex by way of associating beliefs regarding UAI with protective behavior. Questionnaires assessing sexual behavior and related cognitions were completed by…
Reasons for compliance or noncompliance with advice to test for hepatitis C via an internet-mediated blood screening service
Features specific to the online service played a significant role in motivation to test for HCV above and beyond the more conventional perceived health benefits of HCV testing. However, some online specific features were considered problematic and need to be adapted. Methods and strategies for dealing with these impeding factors and for improving compliance with testing via the online service are outlined
Serosorting and sexual risk behaviour according to different casual partnership types among MSM
Among HIV-negative men who have sex with men (MSM), any incident of unprotected anal intercourse (UAI) between casual partners is usually regarded as risky for HIV transmission. However, men are increasingly using knowledge of their casual partner's HIV-status to reduce HIV risk during UAI (i.e., serosorting). Since familiarity between casual partners may lead to higher levels of UAI and serosorting, we examined how often men have UAI and practic…
Undetectable Viral Load and the Decision to Engage in Unprotected Anal Intercourse Among HIV-Positive MSM
High awareness of hepatitis C virus (HCV) but limited knowledge of HCV complications among HIV-positive and HIV-negative men who have sex with men
Hepatitis C virus (HCV) has emerged as a sexually transmitted infection among HIV-positive men who have sex with men (MSM) in high-income countries. Little is reported about HCV awareness among MSM, although this is essential for developing targeted prevention strategies. We, therefore, studied HCV awareness and knowledge among HIV-positive and HIV-negative MSM from the Amsterdam Cohort Studies (ACS). During two visits, 1 year apart and starting …
Same-sex sexual attraction, behavior, and practices of Jewish men in Israel and the association with HIV prevalence
In order to efficiently direct efforts and resources required for the prevention of HIV and other sexually transmitted infection among men who have sex with men (MSM) in Israel, it is necessary to define their particular behaviors, estimate their size, and asses the HIV-burden. This cross-sectional study included a sub-sample from a random representative National study performed in Israel, which included Jewish males aged 18-44 who completed onli…
“We are our choices” – Aids impact special issue Amsterdam 2015
International audience
Sexual Orientation and Behavior of Adult Jews in Israel and the Association With Risk Behavior
What will it really take to end the HIV epidemic
International audience
Ability to Monitor National Responses to the HIV Epidemic “Beyond Viral Suppression”
Objective: With more PLHIV aging into their 50s and beyond in settings where antiretroviral therapy is widely available, non-AIDS comorbidities and health-related quality of life (HRQoL) are becoming major challenges. Information is needed about whether national HIV monitoring programmes have evolved to reflect the changing focus of HIV care. Methods: We created a 56-item English-language survey to assess whether health systems report on common h…
Aidsimpact 2019 special issue – Promises to keep and miles to go
The Rhythm of Risk
HIV risk perception plays a crucial role in the uptake of preventive strategies. We investigated how risk perception and its determinants changed between 1999 and 2018 in an open, prospective cohort of 1323 HIV-negative men who have sex with men (MSM). Risk perception, defined as the perceived likelihood of acquiring HIV in the past 6 months, changed over time: being relatively lower in 2008-2011, higher in 2012-2016, and again lower in 2017-2018…
Types of Group Sex and Their Association with Different Sexual Risk Behaviors Among HIV-Negative Men Who Have Sex with Men
The Burden of Living With HIV is Mostly Overestimated by HIV-Negative and Never-Tested Men Who Have Sex With Men
Understanding Reasons for HIV Late Diagnosis
Since the introduction of effective anti-retroviral therapy, early diagnosis and treatment of HIV have become increasingly important from individual and public health perspectives. People who are diagnosed with a CD4 count below 350 cells/μL blood are today considered to be "late" diagnoses. In an effort to understand the reasons for late diagnosis, we conducted in-depth interviews (n = 14) in Amsterdam, the Netherlands. Two main factors were ide…
The Impact of Pre-exposure Prophylaxis on Sexual Well-Being Among Men Who Have Sex with Men
The social meanings of PrEP use - A mixed-method study of PrEP use disclosure in Antwerp and Amsterdam
Pre-Exposure Prophylaxis (PrEP) is a novel HIV prevention tool. PrEP stigma is a frequently reported barrier, while social disclosure of PrEP use may be an important facilitator. We explored how PrEP users managed PrEP use disclosure using a symbolic interactionist approach. We interviewed 32 participants from two PrEP demonstration projects (Be-PrEP-ared, Antwerp; AMPrEP, Amsterdam). We validated qualitative findings through Be-PrEP-ared questio…
Changes in substance use among HIV-negative MSM
Mpox vaccination willingness, determinants, and communication needs in gay, bisexual, and other men who have sex with men, in the context of limited vaccine availability in the Netherlands (Dutch Mpox…
Introduction: In the 2022 multicountry mpox (formerly named monkeypox) outbreak, several countries offered primary preventive vaccination (PPV) to people at higher risk for infection. We study vaccine acceptance and its determinants, to target and tailor public health (communication-) strategies in the context of limited vaccine supply in the Netherlands. Methods: Online survey in a convenience sample of gay, bisexual and other men who have sex w…
The power for action – now
Opportunities for improved indicator-based HIV testing in the hospital setting
Indicator condition (IC)-guided HIV testing, i.e., testing when diagnosing a condition associated with HIV, is a feasible and cost-effective testing strategy to identify undiagnosed individuals. Assessing determinants for IC-guided testing may identify opportunities for improvement. A survey study based on the Theory of Planned Behaviour (TPB) was conducted among 163 hospital physicians from five specialties in Amsterdam, the Netherlands. Structu…
Promoting HIV-Testing Amongst Gay, Bisexual and Other Men who have Sex with Men in Amsterdam
Late HIV diagnosis remains prevalent in gay, bisexual, and other men who have sex with men (GBMSM) in Amsterdam and is associated with ongoing transmission. Drawing on proven but underused intervention development approaches, we co-created an innovative communication campaign with GBMSM and HIV prevention experts to promote HIV-testing amongst never or not recently tested GBMSM. The campaign addressed behavioral determinants of HIV testing throug…
Intentions to use different modalities of long-acting HIV PrEP among men who have sex with men and transgender and gender diverse persons in the Netherlands
Insight into intentions to use long-acting HIV pre-exposure prophylaxis (PrEP) is essential for successful implementation. We assessed intention to use three hypothetical long-acting PrEP modalities (oral, intramuscular and subdermal) among HIV-negative men who have sex with men (MSM) and transgender and gender diverse persons in Amsterdam, recruited through the Amsterdam Cohort Studies (ACS-participants) and social media (survey-participants). I…
Understanding problematic versus non-problematic chemsex practices from a user's perspective
Chemsex is predominantly reported among men who have sex with men (MSM) and plays an important role in HIV transmission and prevention, being associated with heightened vulnerability to HIV and other sexually transmitted infections. While often used recreationally, chemsex is linked to physical and mental health harms. This study explores how participants define problematic chemsex and perceive contributing and protective factors. Semi-structured…
Medicine (20 works) · HIV/AIDS Research and Interventions (19 works) · Psychology (15 works) · HIV, Drug Use, Sexual Risk (14 works) · Men who have sex with men (14 works) · Family medicine (11 works) · Demography (10 works) · Human immunodeficiency virus (HIV) (8 works) · Psychiatry (8 works) · Adolescent Sexual and Reproductive Health (7 works)