What can surveillance of genital warts tell us?

Sexual Health ◽  
2010 ◽  
Vol 7 (3) ◽  
pp. 325 ◽  
Author(s):  
Christopher K. Fairley ◽  
Basil Donovan
Keyword(s):  
Hpv Vaccine ◽  
Cumulative Risk ◽  
Genital Warts ◽  
Surveillance Data ◽  
Basic Reproductive Number ◽  
Reproductive Number ◽  
Cross Sectional ◽  
Younger Women ◽  
Serological Studies ◽  
Sex With Men

In this Review, we describe the recent epidemiology of genital warts and postulate what the future may hold as a result of the introduction of the quadrivalent human papillomavirus (HPV) vaccine. HPV types 6 or 11 are responsible for most cases and they develop in about two-thirds of women a few months after HPV 6 or 11 infections are first detected by polymerase chain reaction. Surveillance data, cohort studies and cross-sectional surveys suggest that the annual incidence of genital warts exceeds 1% and serological studies suggest cumulative risk up to 40 years of age for HPV 6 or 11 is over 25%. The quadrivalent HPV vaccine is highly effective against genital warts and Australian surveillance data in the 2 years after the introduction of the vaccine have shown large declines in younger women and to a lesser degree heterosexual men. No significant changes in older women or men who have sex with men were seen. Given the success of Australia’s catch-up program it will not be long before we know if the basic reproductive number for genital warts holds the prospect of elimination. However, if genital warts stabilise at a lower, but not very low, rate we will know that elimination will not be possible without vaccination of males.

scholarly journals High Human Papillomavirus Vaccine Acceptability and Cost-Effectiveness of the Chinese 2-Valent Vaccine Among Men Who Have Sex With Men: A Cross-Sectional Study in Shenyang, China

2021 ◽  
Vol 8 ◽  
Author(s):  
Ze-Hao Ye ◽  
Zhao-Zhen Liu ◽  
Si-Tong Cui ◽  
Zhen-Xing Chu ◽  
Yong-Jun Jiang ◽  
...  
Keyword(s):  
Human Papillomavirus ◽  
Cost Effectiveness ◽  
Hpv Vaccine ◽  
Online Survey ◽  
Cost Effective ◽  
Hpv Infection ◽  
Human Papillomavirus Vaccine ◽  
Vaccine Acceptability ◽  
Cross Sectional ◽  
Sex With Men

Background: Despite the insupportable burden caused by the human papillomavirus (HPV) and high vaccine acceptability, vaccination programs are not currently available for men who have sex with men (MSM). We aimed to assess HPV infection by examining the willingness for vaccination among MSM and cost-effectiveness of the Chinese 2-valent HPV vaccine.Methods: We recruited MSM in Shenyang, China between July and December 2020 to conduct anal HPV testing and an online survey regarding HPV-related knowledge and vaccine acceptability. We performed a cost-effectiveness analysis to evaluate the incremental cost-effectiveness ratios (ICERs) of the Chinese 2-valent HPV vaccine.Results: A total of 234 participants completed the online survey; of those, 203 were successfully tested for HPV. The median age was 30 years [interquartile range (IQR): 23–38 years]. Most participants had at least undergraduate education (136/234, 58.1%). The acceptability rate for the free HPV vaccine was 57.7% (135/234). The prevalence of HPV types 16 and 18 was 14.9% (18/121) and 26.8% (22/82) in the willing and unwilling to vaccinate groups, respectively (P > 0.05). The prevalence of high-risk HPV among participants aged <30 and ≥50 years was 48.6 and 38.9%, respectively. Using the Chinese per capita gross domestic product (GDP) as a threshold, the Chinese 2-valent HPV vaccine would be a “very cost-effective” strategy, with an ICER value of USD 4,411. This evidence showed that the Chinese 2-valent HPV vaccine was more cost-effective than other imported vaccines.Conclusions: Targeted strategies should be utilized in MSM with different rates of vaccine acceptability. A pilot HPV vaccination program based on the Chinese 2-valent HPV vaccine for MSM is urgently warranted to reduce the burden of HPV and anal cancer.

scholarly journals Cutaneous Leishmaniasis in dogs: is high seroprevalence indicative of a reservoir role?

Parasitology ◽  
2015 ◽  
Vol 142 (9) ◽  
pp. 1202-1214 ◽  
Author(s):  
JOSÉ E. CALZADA ◽  
AZAEL SALDAÑA ◽  
KADIR GONZÁLEZ ◽  
CHYSTRIE RIGG ◽  
VANESSA PINEDA ◽  
...  
Keyword(s):  
Cutaneous Leishmaniasis ◽  
Complex Disease ◽  
Basic Reproductive Number ◽  
Sand Fly ◽  
Reproductive Number ◽  
Cross Sectional ◽  
Rich Diversity ◽  
Ecosystem Level ◽  
Reservoir Hosts ◽  
Sand Fly Vectors

SUMMARYAmerican cutaneous leishmaniasis (ACL) is a complex disease with a rich diversity of animal host species. This diversity imposes a challenge, since understanding ACL transmission requires the adequate identification of reservoir hosts, those species able to be a source of additional infections. In this study we present results from an ACL cross-sectional serological survey of 51 dogs (Canis familiaris), where we used diagnostic tests that measure dog's exposure toLeishmaniaspp. parasites. We did our research in Panamá, at a village that has undergone significant ecosystem level transformations. We found an ACL seroprevalence of 47% among dogs, and their exposure was positively associated with dog age and abundance of sand fly vectors in the houses of dog owners. Using mathematical models, which were fitted to data on the proportion of positive tests as function of dog age, we estimated a basic reproductive number (R0±s.e.) of 1·22 ± 0·09 that indicates the disease is endemically established in the dogs. Nevertheless, this information by itself is insufficient to incriminate dogs as ACL reservoirs, given the inability to find parasites (or their DNA) in seropositive dogs and previously reported failures to experimentally infect vectors feeding on dogs with ACL parasites.

scholarly journals Population density and basic reproductive number of COVID-19 across United States counties

2020 ◽  
Author(s):  
Karla Therese L. Sy ◽  
Laura F. White ◽  
Brooke Nichols
Keyword(s):  
Population Density ◽  
Transmission Probability ◽  
Basic Reproductive Number ◽  
Reproductive Number ◽  
Main Mode ◽  
Cross Sectional ◽  
Rate Of Spread ◽  
Contact Rates ◽  
Random Intercept ◽  
Private Transportation

AbstractThe basic reproductive number (R0) is a function of contact rates among individuals, transmission probability, and duration of infectiousness. We sought to determine the association between population density and R0 of SARS-CoV-2 across U.S. counties, and whether population density could be used as a proxy for contact rates. We conducted a cross-sectional analysis using linear mixed models with random intercept and fixed slopes to assess the association of population density and R0. We also assessed whether this association was differential across county-level main mode of transportation-to-work percentage. Counties with greater population density have greater rates of transmission of SARS-CoV-2, likely due to increased contact rates in areas with greater density. The effect of population density and R0 was not modified by private transportation use. Differential R0 by population density can assist in more accurate predictions of the rate of spread of SARS-CoV-2 in areas that do not yet have active cases.Article Summary LineU.S. counties with greater population density have greater rates of transmission of SARS-CoV-2, likely due to increased contact rates in areas with greater density.

Human papillomavirus vaccination and sexual practices among men who have sex with men in Melbourne, Australia: a cross-sectional study

2020 ◽  
Vol 31 (4) ◽  
pp. 312-317
Author(s):  
Eric PF Chow ◽  
Ei T Aung ◽  
Marcus Y Chen ◽  
Catriona S Bradshaw ◽  
Christopher K Fairley
Keyword(s):  
Human Papillomavirus ◽  
Hpv Vaccine ◽  
Hpv Vaccination ◽  
Health Centre ◽  
Cross Sectional Study ◽  
Sexual Practices ◽  
Human Papillomavirus Vaccination ◽  
Cross Sectional ◽  
Sex With Men ◽  
Hiv Negative

The aim of this study was to explore the factors associated with self-reported receipt of human papillomavirus (HPV) vaccine among men who have sex with men (MSM). MSM aged 16–40 years attending the Melbourne Sexual Health Centre, Australia, for their first visit in 2016 were included in the analysis. Multivariable logistic regression analyses were performed to examine the association between self-reported HPV vaccination and sexual practices: one examining the sexual practices. A total of 1332 MSM with a mean age of 27.6 (standard error [SE] = 0.1) were included in the analysis. The mean number of reported male partners in the last 3 and 12 months was 4.0 (SE = 0.1) and 8.9 (SE = 0.4), respectively. Six percent ( n =  81) of MSM reported receiving the HPV vaccine. There was no significant association between sexual practices (the number of partners or condomless anal sex) and self-reported HPV vaccine receipt after adjusting for confounding factors such as human immunodeficiency virus (HIV) status and pre-exposure prophylaxis (PrEP). HIV-negative MSM taking PrEP were three times more likely to be vaccinated against HPV compared with HIV-negative MSM not taking PrEP in both multivariable analyses. Our findings suggest that there is no association between HPV vaccination and sexual risk practices in MSM.

scholarly journals Low vaccination coverage for human papillomavirus disease among young men who have sex with men, France, 2019

2021 ◽  
Vol 26 (50) ◽  
Author(s):  
Giuseppina Ortu ◽  
Anne-Sophie Barret ◽  
Kostas Danis ◽  
Lucie Duchesne ◽  
Daniel Levy-Bruhl ◽  
...  
Keyword(s):  
Human Papillomavirus ◽  
Vaccination Coverage ◽  
Rural Areas ◽  
Hpv Vaccine ◽  
Online Survey ◽  
Vaccine Coverage ◽  
Hpv Vaccination ◽  
Cross Sectional ◽  
Vaccination Uptake ◽  
Sex With Men

Background In France, human papillomavirus (HPV) vaccination has been recommended in 2016 for men who have sex with men (MSM) up to age 26 years. Aim We aimed to estimate HPV vaccine coverage in 18–28 year-old MSM and identify uptake determinants. Methods We collected data on socio-demographic characteristics, sexual behaviour, sexually transmitted diseases (STI) screening and vaccination uptake using a voluntary cross-sectional online survey conducted in 2019 targeting MSM. We calculated coverage of at least one dose of HPV vaccine and prevalence ratios (PR) of determinants with 95% confidence intervals (CI) using Poisson regression. Results Of 9,469 respondents (age range: 18–28 years), 15% (95% CI: 14–16) reported being vaccinated for HPV. Coverage was significantly higher among MSM < 24 years (PR: 1.25; 95% CI: 1.13–1.39), with education level below university degree (PR: 1.12; 95% CI: 1.08–1.32), living in rural areas (PR: 1.21; 95% CI: 1.08–1.36), attending sex parties (PR: 1.12; 95% CI: 1.03–1.33), using HIV-related biomedical prevention methods (PR: 1.31; 95% CI: 1.12–1.54), with STI diagnosis (PR: 1.22; 95% CI: 1.08–1.38) and with hepatitis A or B vaccination (PR: 4.56; 95% CI: 3.63–5.81 vs PR: 3.35; 95% CI: 2.53–4.44). Conclusions The HPV vaccination uptake among MSM in France was not satisfactory. It was higher among MSM benefitting from other vaccinations and biomedical preventive methods against HIV, suggesting a synergistic effect of the national preventive sexual health recommendations for MSM. Further efforts to improve HPV vaccination coverage targeting MSM are warranted.

scholarly journals Implementation and evaluation of the human papillomavirus (HPV) vaccination pilot for men who have sex with men (MSM), England, April 2016 to March 2017

2019 ◽  
Vol 24 (8) ◽  
Author(s):  
Michael Edelstein ◽  
Nalini Iyanger ◽  
Nicola Hennessy ◽  
David Mesher ◽  
Marta Checchi ◽  
...  
Keyword(s):  
Human Papillomavirus ◽  
Hpv Vaccine ◽  
Urban Areas ◽  
Hpv Vaccination ◽  
Vaccine Dose ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Sex With Men ◽  
Sexual Health Clinics ◽  
To Receive

Background: Opportunistic human papillomavirus (HPV) vaccination for men who have sex with men (MSM) was piloted in sexual health clinics (SHC) in England between 2016 and 2018. Aim: to evaluate the pilot’s first year (April 2016–March 2017) in terms of feasibility, acceptability, uptake, impact and equity and interpret the outcome in the context of wide HPV vaccination policy. Methods: Attendance and uptake data from routine SHC surveillance datasets and a cross-sectional survey administered to individuals receiving the vaccine were analysed. Results: Among 18,875 eligible MSM, 8,580 (45.5%) were recorded as having received one HPV vaccine dose, decreasing slightly with increasing age, and uptake was higher in rural than urban areas. Survey results suggested that of those receiving the first dose of HPV vaccine, 8% were new attendees and that among those, less than 11% attended just to receive the vaccine. Of those having their first HPV vaccination, 95% indicated they would like to receive the next vaccine doses at the same clinic and 85% of patients reported accessing other services when visiting SHC for the first dose of vaccine. Conclusion: An opportunistic HPV vaccination programme for MSM can be delivered in an acceptable and, as far as can be evaluated, equitable manner, without major disruption to SHC and HIV clinics.

Fraud Detection Protocol for Web-Based Research Among Men Who Have Sex With Men: Development and Descriptive Evaluation (Preprint)

2018 ◽  
Author(s):  
April M Ballard ◽  
Trey Cardwell ◽  
April M Young
Keyword(s):  
Survey Research ◽  
Hiv Transmission ◽  
Personal Information ◽  
Fraud Detection ◽  
Detection Algorithm ◽  
Cross Sectional ◽  
Web Based ◽  
Young Msm ◽  
Data Survey ◽  
Sex With Men

BACKGROUND Internet is becoming an increasingly common tool for survey research, particularly among “hidden” or vulnerable populations, such as men who have sex with men (MSM). Web-based research has many advantages for participants and researchers, but fraud can present a significant threat to data integrity. OBJECTIVE The purpose of this analysis was to evaluate fraud detection strategies in a Web-based survey of young MSM and describe new protocols to improve fraud detection in Web-based survey research. METHODS This study involved a cross-sectional Web-based survey that examined individual- and network-level risk factors for HIV transmission and substance use among young MSM residing in 15 counties in Central Kentucky. Each survey entry, which was at least 50% complete, was evaluated by the study staff for fraud using an algorithm involving 8 criteria based on a combination of geolocation data, survey data, and personal information. Entries were classified as fraudulent, potentially fraudulent, or valid. Descriptive analyses were performed to describe each fraud detection criterion among entries. RESULTS Of the 414 survey entries, the final categorization resulted in 119 (28.7%) entries identified as fraud, 42 (10.1%) as potential fraud, and 253 (61.1%) as valid. Geolocation outside of the study area (164/414, 39.6%) was the most frequently violated criterion. However, 33.3% (82/246) of the entries that had ineligible geolocations belonged to participants who were in eligible locations (as verified by their request to mail payment to an address within the study area or participation at a local event). The second most frequently violated criterion was an invalid phone number (94/414, 22.7%), followed by mismatching names within an entry (43/414, 10.4%) and unusual email addresses (37/414, 8.9%). Less than 5% (18/414) of the entries had some combination of personal information items matching that of a previous entry. CONCLUSIONS This study suggests that researchers conducting Web-based surveys of MSM should be vigilant about the potential for fraud. Researchers should have a fraud detection algorithm in place prior to data collection and should not rely on the Internet Protocol (IP) address or geolocation alone, but should rather use a combination of indicators.

scholarly journals Dynamics analysis of an online gambling spreading model on scale-free networks

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Yu Kong ◽  
Tao Li ◽  
Yuanmei Wang ◽  
Xinming Cheng ◽  
He Wang ◽  
...  
Keyword(s):  
Network Topology ◽  
Negative Impact ◽  
Online Gambling ◽  
Basic Reproductive Number ◽  
Reproductive Number ◽  
Scale Free ◽  
Spreading Model ◽  
Spreading Dynamics ◽  
Scale Free Networks ◽  
Gambling Policy

AbstractNowadays, online gambling has a great negative impact on the society. In order to study the effect of people’s psychological factors, anti-gambling policy, and social network topology on online gambling dynamics, a new SHGD (susceptible–hesitator–gambler–disclaimer) online gambling spreading model is proposed on scale-free networks. The spreading dynamics of online gambling is studied. The basic reproductive number $R_{0}$ R 0 is got and analyzed. The basic reproductive number $R_{0}$ R 0 is related to anti-gambling policy and the network topology. Then, gambling-free equilibrium $E_{0}$ E 0 and gambling-prevailing equilibrium $E_{ +} $ E + are obtained. The global stability of $E_{0}$ E 0 is analyzed. The global attractivity of $E_{ +} $ E + and the persistence of online gambling phenomenon are studied. Finally, the theoretical results are verified by some simulations.

scholarly journals Trends and differences in sexual practices and sexually transmitted infections in men who have sex with men only (MSMO) and men who have sex with men and women (MSMW): a repeated cross-sectional study in Melbourne, Australia

BMJ Open ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. e037608
Author(s):  
Mario Martín-Sánchez ◽  
Richard Case ◽  
Christopher Fairley ◽  
Jane S Hocking ◽  
Catriona Bradshaw ◽  
...  
Keyword(s):  
Health Centre ◽  
Cross Sectional Study ◽  
Sexual Practices ◽  
Sectional Study ◽  
Anal Sex ◽  
Cross Sectional ◽  
Men And Women ◽  
Sexually Transmitted ◽  
Receptive Anal Sex ◽  
Sex With Men

ObjectivesIn the 2010s, there has been an increase in sexually transmitted infections (STI) in men who have sex with men (MSM) in Australia, and since 2015 also in urban heterosexuals. Men who have sex with both men and women (MSMW) have characteristics that may differ from both men who have sex with men only (MSMO) and heterosexual men. We aimed to compare the sexual practices and the trends in HIV/STI positivity between MSMO and MSMW.DesignRepeated cross-sectional study.SettingA sexual health centre in Melbourne, Australia.ParticipantsMSM aged 18 years and above who attended the Melbourne Sexual Health Centre for the first time between 2011 and 2018. This includes 12 795 MSMO and 1979 MSMW.Primary outcome measuresDemographic characterics, sexual practices and HIV/STI positivity.ResultsCompared with MSMW, MSMO were more likely to practice anal sex and to have condomless receptive anal sex with casual male partners, and less likely to have a current regular relationship. Over the 8-year period, there was an increase in condomless receptive anal sex with casual male partners for both groups (MSMO: from 46.2% to 63.3%, ptrend <0.001; MSMW: from 41.3% to 57.9%, ptrend=0.011). Syphilis positivity increased in MSMO (from 5.5% to 7.9%, ptrend=0.012) and MSMW (from 0.9% to 6.4%, ptrend=0.004) and HIV remained stable. Gonorrhoea increased among MSMO from 2011 to 2014 (from 6.7% to 9.6%, ptrend=0.002), and remained stable from 2015 to 2018. MSMO had higher odds of testing positive for gonorrhoea (adjusted OR (aOR) 1.36, 95% CI 1.13 to 1.64), chlamydia (aOR 1.39, 95% CI 1.16 to 1.67), syphilis (aOR 1.74, 95% CI 1.37 to 2.22) and HIV (aOR 4.60, 95% CI 2.43 to 8.70) than MSMW.ConclusionsMSMW have overall lower condomless sex and lower HIV/STI positivity. In the last years, changes in sexual practices in MSM have affected both MSMW and MSMO leading to an increased STI risk.

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