RICARDO DE PAULA VASCONCELOS
Projetos de Pesquisa
Unidades Organizacionais
LIM/52 - Laboratório de Virologia, Hospital das Clínicas, Faculdade de Medicina
11 resultados
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- Natural experiment of syphilis treatment with doxycycline or benzathine penicillin in HIV-infected patients(2019) ANTONIO, Marilia B.; CUBA, Gabriel T.; VASCONCELOS, Ricardo P.; ALVES, Ana Paula P. S.; SILVA, Bruna Oliveira da; AVELINO-SILVA, Vivian IidaBackground: Although doxycycline is widely used as an alternative to benzathine penicillin for the treatment of early and late latent syphilis, data on serological response following treatment with doxycycline among HIV-infected patients are limited. Methods: In this study, we analysed serological response to syphilis treatment with doxycycline among HIV-infected patients treated during a benzathine penicillin shortage period and compared with treatment response among patients treated with benzathine penicillin. Cases with neurosyphilis and those treated with suboptimal doses or with concurrent medications in association with benzathine penicillin or doxycycline were excluded. Results: Fifty patients treated with doxycycline from September 2014 to December 2016 were compared with 115 patients treated with benzathine penicillin for early, late latent or latent syphilis of unknown duration. Patients treated with doxycycline were slightly older [(median 49 years old, 95% confidence interval (95% CI) 43-56] than those in the penicillin group (median 44 years old, 95% CI 37-50; P = 0.007). Groups had no statistically significant differences regarding sex, HIV suppression under treatment and syphilis stages. Serological response to treatment, defined as a nonreagent Venereal Disease Research Laboratory (VDRL) or at least a four-fold reduction in VDRL titres measured 6-12 months after treatment, was seen in 72% (95% CI 58-84) of patients treated with doxycycline and 70% (95% CI 60-78) of patients treated with penicillin (P = 0.753). Conclusion: We found no statistically significant differences in serological response to treatment with doxycycline or benzathine penicillin among HIV-infected patients with early, late latent or latent syphilis of unknown duration. Our findings suggest that doxycycline is an acceptable treatment to HIV-infected patients with nontertiary stages of syphilis.
- Attitudes and Knowledge About Human Immunodeficiency Virus Pre-Exposure Prophylaxis Among Brazilian Infectious Disease Physicians(2020) CERQUEIRA, Natalia Barros; VASCONCELOS, Ricardo; HOJILLA, J. Carlo; KALLAS, Esper Georges; I, Vivian Avelino-SilvaThe objective was to describe levels and predictors of knowledge, attitudes, and willingness to prescribe pre-exposure prophylaxis (PrEP) among Brazilian Infectious Disease (ID) Physicians. The design was a cross-sectional study. We collected information on demographics and attitudes/knowledge about PrEP using an anonymous electronic survey. Willingness to prescribe PrEP, fear of adherence issues, and concerns about risk compensation were addressed in three case vignettes that varied by a single characteristic (i.e., by gender identity, drug use, and socioeconomic status) randomly assigned to physicians. Three hundred seventy ID physicians responded to the survey. Although most identified as informed/well informed about PrEP (75%) and believed PrEP availability to be necessary (38%), concerns with adherence (49%), side effects (38%), risk compensation (28%), and increase in sexually transmitted infection incidence (38%) were raised. We found no statistically significant differences in willingness to prescribe PrEP and concerns around risk compensation across the three case vignettes. ID physicians who declared having a religion reported more concerns about risk compensation compared to those self-identified as atheists (72% vs. 46%,p < .001). Most Brazilian ID physicians reported a positive attitude toward PrEP. Patients' gender identity, drug use, and socioeconomic status were not associated with willingness to prescribe PrEP. However, ID physicians who declared having a religion were more frequently concerned about risk compensation among PrEP users, suggesting that personal beliefs can influence PrEP implementation.
- Predictors of knowledge of and access to biomedical prevention among MSM and transgender men in Latin America: Results from the Latin American internet survey(2022) AVELINO-SILVA, Vivian Iida; VASCONCELOS, Ricardo; CERQUEIRA, Natalia B.; MARCUS, Ulrich; SCHMIDT, Axel Jeremias; VERAS, Maria AmeliaIntroduction HIV is still a central public health issue in Latin America, disproportionally affecting key populations. Knowledge and access to biomedical prevention strategies, including treatment as prevention (TASP) or undetectable = untransmissible (U=U), pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP), are the first steps to increasing uptake. We used data from the Latin American MSM Internet Survey (LAMIS) to describe knowledge and access to biomedical HIV prevention strategies among gay, bisexual, transgender and other men who have sex with men (MSM) living in 18 Latin American countries. Methods We compared LAMIS data across countries and according to age categories using frequencies and percentages. We also used multivariable models to explore whether age, gender identity, sexual identity, steady partnership, HIV status and education were independently associated with outcomes. Results In all, 55 924 participants were included. Most were cisgender (99%) and identified as gay/homosexual (77%) or bisexual (17%). Schooling levels were very high, with 89% reporting highest attained education as tertiary level, university or post-graduation. In total, 16% had been previously diagnosed with HIV; of those, rates of undetectable viral load varied from 60% in Venezuela to 83% in Brazil. Overall, 54%, 54% and 52% of participants already knew about PEP, PrEP and U=U, respectively. Participants from Brazil and those aged between 26 and 55 years, living with diagnosed HIV and having a gay/homosexual identity had greater levels of awareness about biomedical prevention strategies. Conclusions Our study highlights gaps in HIV prevention campaigns directed to MSM in Latin America resulting in low uptake of biomedical prevention methods.
- Retention, engagement, and adherence to pre-exposure prophylaxis for men who have sex with men and transgender women in PrEP Brasil: 48 week results of a demonstration study(2018) GRINSZTEJN, Beatriz; HOAGLAND, Brenda; MOREIRA, Ronaldo I.; KALLAS, Esper G.; MADRUGA, Jose V.; GOULART, Silvia; LEITE, Iuri C.; FREITAS, Lucilene; MARTINS, Luana M. S.; TORRES, Thiago S.; VASCONCELOS, Ricardo; BONI, Raquel B. De; ANDERSON, Peter L.; LIU, Albert; LUZ, Paula M.; VELOSO, Valdilea G.Background PrEP Brasil was a demonstration study to assess feasibility of daily oral tenofovir diphosphate disoproxil fumarate plus emtricitabine provided at no cost to men who have sex with men (MSM) and transgender women at high risk for HIV within the Brazilian public health system. We report week 48 pre-exposure prophylaxis (PrEP) retention, engagement, and adherence, trends in sexual behaviour, and incidence of HIV and sexually transmitted infections in this study cohort. Methods PrEP Brasil was a 48 week, open-label, demonstration study that assessed PrEP delivery at three referral centres for HIV prevention and care in Rio de Janeiro, Brazil (Fundacao Oswaldo Cruz), and Sao Paulo, Brazil (Universidade de Sao Paulo and Centro de Referencia e Treinamento em DST e AIDS). Eligible participants were MSM and transgender women who were HIV negative, aged at least 18 years, resident in Rio de Janeiro or Sao Paulo, and reported one or more sexual risk criteria in the previous 12 months (eg, condomless anal sex with two or more partners, two or more episodes of anal sex with an HIV-infected partner, or history of sexually transmitted infection [STI] diagnosis). Participants were seen at weeks 4, 12, 24, 36, and 48 for PrEP provision, clinical and laboratory evaluation, and HIV testing. Computer-assisted self-interviews were also done at study visits 12, 24, 36, and 48, and assessed sexual behaviour and drug use. PrEP retention was defined by attendance at the week 48 visit, PrEP engagement was an ordinal five-level variable combining presence at the study visit and drug concentrations, and PrEP adherence was evaluated by measuring tenofovir diphosphate concentrations in dried blood spots. Logistic regression models were used to quantify the association of variables with high adherence (>= 4 doses per week). The study is registered with ClinicalTrials. gov, number NCT01989611. Findings Between April 1, 2014, and July 8, 2016, 450 participants initiated PrEP, 375 (83%) of whom were retained until week 48. At week 48, 277 (74%) of 375 participants had protective drug concentrations consistent with at least four doses per week: 183 (82%) of 222 participants from Sao Paulo compared with 94 (63%) of 150 participants from Rio de Janeiro (adjusted odds ratio 1.88, 95% CI 1.06-3.34); 119 (80%) of 148 participants who reported sex with HIV-infected partners compared with 158 (70%) of 227 participants who did not (1.78, 1.03-3.08); 67 (87%) of 77 participants who used stimulants compared with 210 (71%) of 298 participants who did not (2.23, 1.02-4.92); and 232 (80%) of 289 participants who had protective concentrations of tenofovir disphosphate at week 4 compared with 42 (54%) of 78 participants who did not (3.28, 1.85-5.80). Overall, receptive anal sex with the last three partners increased from 45% at enrolment to 49% at week 48 (p=0.17), and the mean number of sexual partners in the previous 3 months decreased from 11.4 (SD 28.94) at enrolment to 8.3 (19.55) at week 48 (p<0.0013). Two individuals seroconverted during follow-up (HIV incidence 0.51 per 100 person-years, 95% CI 0.13-2.06); both of these patients had undetectable tenofovir concentrations at seroconversion. Interpretation Our results support the effectiveness and feasibility of PrEP in a real-world setting. Offering PrEP at public health-care clinics in a middle-income setting can retain high numbers of participants and achieve high levels of adherence without risk compensation in the investigated populations.
conferenceObject Attitudes and Knowledge About HIV PrEP Among Infectious Diseases Physicians in Brazil(2018) CERQUEIRA, Natalia; VASCONCELOS, Ricardo; HOJILLA, Carlo; KALLAS, Esper; AVELINO-SILVA, VivianconferenceObject Number of Sexual Partners Does Not Predict HIV Status in a Brazilian STI Clinic(2018) VASCONCELOS, Ricardo; AVELINO-SILVA, Vivian; ALVES, Ana Paula; NORONHA, Nicole; PICONE, Camila; SILVA, Bruna; SEGURADO, Aluisio- Asymptomatic anorectal Chlamydia trachomatis and Neisseria gonorrhoeae infections are associated with systemic CD8(+) T-cell activation(2017) VIEIRA, Vinicius A.; AVELINO-SILVA, Vivian I.; CERQUEIRA, Natalia B.; COSTA, Dayane A.; COSTA, Priscilla R.; VASCONCELOS, Ricardo P.; MADRUGA, Valdez R.; MOREIRA, Ronaldo I.; HOAGLAND, Brenda; VELOSO, Valdilea G.; GRINSZTEJN, Beatriz; KALLAS, Esper G.Background: Oral preexposure prophylaxis (PrEP) has been established as a pivotal strategy in HIV prevention. However, bacterial sexually transmitted infections (STIs), such as Chlamydia trachomatis and Neisseria gonorrhoeae, are also highly prevalent. Although the presence of STI-related mucosal lesions is a known risk factor for HIV acquisition, the potential increase in risk associated with asymptomatic STIs is not completely understood. Recent data demonstrated higher T-cell activation is a risk factor for sexually acquired HIV-1 infection. We examined the effect of asymptomatic C. trachomatis and N. gonorrhoeae anorectal infection on systemic immune activation, potentially increasing the risk of HIV acquisition. Methods: We analyzed samples from participants of PrEP Brasil, a demonstration study of daily oral emtricitabine/tenofovir disoproxil fumarate HIV PrEP among healthy MSM, for T-cell activation by flow cytometry. We included 34 asymptomatic participants with anorectal swab for C. trachomatis and/or N. gonorrhoeae infection, whereas negative for other STIs, and 35 controls. Results: We found a higher frequency of human leukocyte antigen DR(+)CD3(+)CD8(+)T cells (1.5 vs. 0.9%, P<0.005) and with memory phenotype in the group with asymptomatic C. trachomatis and/or N. gonorrhoeae infection. Exhaustion and senescence markers were also significant higher in this group. No difference was observed in the soluble CD14 levels. Conclusion: Our findings suggest asymptomatic anorectal C. trachomatis and/or N. gonorrhoeae increase systemic immune activation, potentially increasing the risk of HIV acquisition. Regular screening and treatment of asymptomatic STIs should be explored as adjuvant tools for HIV prevention.
bookPart Infecção pelo Vírus da Imunodeficiência Humana (HIV) e Síndrome da Imunodeficiência Adquirida (Aids)(2016) SEGURADO, Aluísio Augusto Cotrim; FREITAS, Angela Carvalho; ATOMIYA, Angela Naomi; WüNSCH, Celia Torrens; NOVAES, Christina Terra Gallafrio; HIGASHINO, Hermes Ryoiti; BERMUDEZ, Jose Ernesto Vidal; CHAVES NETTO, Lucas; VICENTINE, Margarete Paganotti; BOULOS, Maria Ivete Castro; LOPES, Max Igor Banks Ferreira; VASCONCELOS, Ricardo de Paula; SANTOS, Sigrid de Sousa dos; MELLO, Valéria Antakly de; AVELINO-SILVA, Vivian Helena Iida- The Changing Epidemiology of Hepatitis C Virus Acquisition Among HIV-Infected Individuals in Brazil(2023) FERRUFINO, Rosario Quiroga; BIERRENBACH, Ana Luiza; RODRIGUES, Camila; FIGUEIREDO, Gerusa Maria; GLEISON, Daniel; YAPURA, Silvia; MATOS, Maria Laura Mariano de; VASCONCELOS, Ricardo; WITKIN, Steven Sol; MENDES-CORREA, Maria CassiaIdentification of mechanisms of hepatitis C virus (HCV) acquisition among HIV-infected people is critical for prevention guidance. The aim of this study was to investigate risk factors for HCV infection and variations in HCV genotype distribution in a cohort of HIV-HCV coinfected patients in Brazil. This was a cross-sectional observational epidemiological study of a cohort of HIV-HCV coinfected individuals seen at a referral center for HIV-infected patients in the city of Sao Paulo between January and December 2017. The time of HCV acquisition, as determined by chart review, was categorized as before 2000, between 2000 and 2009, and from 2010 onward. HCV genotypes were determined by gene amplification and analysis. Among 3,143 HIV-infected individuals analyzed, 362 (11.5%) were HCV-HIV coinfected. Overall, the reported modes of HCV acquisition were sexual exposure in 172 (47.5%), injection drug use (IDU) in 86 (23.8%), use of inhaled drugs in 67 (18.5%) and blood transfusion in 10 (2.8%) individuals. All individuals who acquired HCV after IDU became infected before 2010. HCV acquisition by sexual contact was reported by 26.4%, 65.9%, and 63.8% of patients before 2000, between 2000 and 2009, and from 2010, respectively. There was an increase (p < .001) in the proportion of cases due to sexual transmission from the period before 2000 (26.4%) to between 2000 and 2009 (65.9%). There was no corresponding increase from 2000 and 2009 to after 2010 (p = .751). HCV genotype 1 was most prevalent at all time periods. The genotype 3 frequency decreased over time (test for trend p < .001), whereas genotype 4, extremely uncommon before 2010, became the second most prevalent genotype from 2010 onward. In HIV-infected individuals in Sao Paulo, Brazil, sexual transmission has replaced IDU as the most frequent mode of HCV acquisition.
- HIV self-test: a tool to expand test uptake among men who have sex with men who have never been tested for HIV in Sao Paulo, Brazil(2022) VASCONCELOS, Ricardo; AVELINO-SILVA, Vivian I.; PAULA, Ivone A. de; JAMAL, Leda F.; GIANNA, Maria Clara; SANTOS, Flavio; CAMARGO, Robinson; BARBOSA, Eduardo; CASIMIRO, Gilvane; COTA, Vanda; ABBATE, Maria C.; CRUZ, Marly; SEGURADO, Aluisio C.Objectives HIV self-testing is an effective tool to improve diagnostic coverage in key populations, enabling linkage to care and access to antiretroviral therapy. Its implementation requires better understanding of patients' perspectives on this novel strategy. The aim of the study was to investigate the perception of men who have sex with men (MSM) regarding the HIV oral fluid self-test (HIVST) in Sao Paulo, Brazil, and to analyse the sociodemographic characteristics and testing strategy preferences of individuals registered to undertake HIVST. Methods Preceding the implementation of HIVST use as public policy in 2019, we recruited MSM living in Sao Paulo to undertake HIVST using a digital platform, and investigated their sociodemographic profiles, testing experiences and testing preferences. Results were compared according to reported lifetime HIV testing. Results A total of 6477 MSM (median age 28 years) were recruited to the study from April 9th to December 31st, 2018. Seventy-eight per cent reported previous HIV testing. The opening hours of health facilities (53%), concern about disclosing intimate personal information to health care providers (34%) and fear of stigma (21%) were reported as the main barriers to testing. Older age, higher education, illicit drug use and self-identifying as gay were associated with prior HIV testing (P < 0.001). Most participants (67%) were unaware that HIVST was available before enrolling in the study. Preference for HIVST over other testing technologies was higher among those never tested (71%) than among participants with previous HIV testing (61%; P < 0.001). Conclusions HIVST was found to be an effective tool to improve testing uptake among MSM, particularly those who had never been tested before. Characterization of the most likely users of HIVST among MSM will help to inform implementation and scaling up of this novel testing method in the Brazilian public health system.