Hepatitis B virus markers among teenagers in the Araguaia region, Central Brazil: Assessment of prevalence and vaccination coverage

Melo, Laura Valdiane Luz; Silva, Marcondes Alves Barbosa da; Calçada, Cristiane de Oliveira Rodrigues; Cavalcante, Silvia Raquel Brandão; Souto, Francisco José Dutra

doi:10.1016/j.vaccine.2011.05.011

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…This result is similar to those of a survey conducted at the University of Bahia (Brazil) (11) and a study conducted at the Mato Grosso (Brazil) (30). …”

Section: Discussionsupporting

confidence: 89%

“…However, when the analysis was performed, only among students who reported having completed the vaccination, the percentage of people unprotected decreased to 12.5%, showing the importance of completing the scheme. In the literature, the percentage of healthcare professionals who remain unprotected after 3 doses of vaccine, ranged from 5.85% to 20.9% (7, 24, 30, 31). …”

Section: Discussionmentioning

confidence: 99%

“…Studies have shown that age (7, 9, 32) and the time of vaccination (7, 9, 13, 24, 33) negatively influence the amount of antibodies after completion of the immunization schedule, the number of doses taken increases the concentration of anti-HBs (32) and gender has no influence on seroconversion (7, 9, 30). In this study none of the variables analyzed, influence the concentration of anti-HBs.…”

Section: Discussionmentioning

confidence: 99%

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Hepatitis B: Knowledge, Vaccine Situation and Seroconversion of Dentistry Students of a Public University

et al. 2013

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BackgroundViral hepatitis B (VHB) is an occupational risk for dentists. It is necessary that dental students start clinical practice immunized with the vaccine, response monitored and informed about the means of transmission of the disease. Rarely, there are studies, which evaluate concomitantly knowledge of these academics and their vaccine situation.ObjectivesTo evaluate the knowledge about Hepatitis B, the vaccine situation and the immunization status of dental students and to investigate the probable correlation between the status of immunization, vaccination membership and adherence to the test of seroconversion and associated factors.Patients and Methods189 students from the dentistry course at the Federal University of Piaui (UFPI) who attended from the 3rd to 9th period were invited to participate in the research. Their knowledge about HBV, attitude regarding protection and their vaccine situation were assessed through a self-administered form. Antibodies against surface antigens of Hepatitis B virus (Anti-HBs) and against the antigens of the virus nucleous of Hepatitis B (Anti-HBc total) were measured qualitatively using the enzyme-linked immunosorbent assay (ELISA).ResultsOf the 179 students surveyed, 58.1% knew about the degree of virulence of the Hepatitis B virus (HBV). As to the means of transmission, 98.3% considered blood transmission, 82.6% plates and cutlery, 15.6% cough and 12.3% vertical transmission. Most students (87.4%) knew that they should take 3 doses of the vaccine and 62.2% completed the immunization schedule. A minority of students (48.6%) knew the about the Anti-HBs test and 5.6% took the test. Among the students who reported having taken three doses of the vaccine, 12.5% were not seroconverted. There was no significant correlation between the variables.ConclusionsDental academics were unsure about the means of infection and prevention against HBV. Many of them had not completed the immunization scheme and did not have the test of seroconversion. The serological analysis revealed unprotection, even after students completed the vaccination schedule.

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“…This result is similar to those of a survey conducted at the University of Bahia (Brazil) (11) and a study conducted at the Mato Grosso (Brazil) (30). …”

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Hepatitis B: Knowledge, Vaccine Situation and Seroconversion of Dentistry Students of a Public University

et al. 2013

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“…Only 27% of surveyed individuals remembered having been vaccinated, and the serological marker indicative of vaccine protection was identified in only 18% of uninfected individuals, consistent with the information provided by the participants. A previous study in a small city in a non-Amazonian region in Mato Grosso revealed that 56% of assessed adolescents exhibited evidence of a vaccine response (anti-HBsAg-positivity alone) 21 . Data from our present study are more alarming given that vaccination-related serological patterns were even worse in individuals under 20 years of age.…”

Section: Discussionmentioning

confidence: 95%

Prevalence of hepatitis B and D virus infection in a district of Mato Grosso, bordering Amazonas and Rondônia states

Ferreira-Junior

de-Oliveira

Martin

et al. 2020

Rev. Soc. Bras. Med. Trop.

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Introduction: Brazil's western Amazon basin has the highest prevalence of hepatitis B virus (HBV) infection in the country. Coinfection with hepatitis D virus (HDV) is also endemic. To estimate the prevalence of HBV and HDV markers in a population inhabiting the northwest portion of Mato Grosso state in the western Amazon. Methods: We performed a cross-sectional study of the seroprevalence of antibodies against HBV core antigen (anti-HBc) in the Três Fronteiras District northwest of Mato Grosso. Anti-HBc-positive subjects were tested for HBV surface antigen (HBsAg). Those positive for this marker were tested for HDV antibodies. Anti-HBc-negative participants were tested for anti-HBsAg. All tests were performed by EIA. Results: A total of 623 individuals in the community were assessed; the majority (67.6%) were male, with a mean age of 30.8 ± 15.4 years. Two hundred and fourteen individuals (34.3%) were anti-HBc-positive, and 47 (7.5%) were HBsAg carriers. Only one individual was anti-HDV-positive. Among the 409 individuals without HBV infection, 18.3% were anti-HBsAg-positive. There was no association between HBV infection and known risk factors. Conclusions: The study area had intermediate-to-high endemicity for HBV infection, but a low prevalence of HDV. Our serological results suggesting low vaccinationinduced protection indicate a need for reinforced immunization programs in the populations of northwest Mato Grosso.

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Implementation and Impact of HAV and HBV Vaccination Programs in South America

Paraná

Schinoni

2013

Curr Hepatitis Rep

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Hepatitis B virus markers among teenagers in the Araguaia region, Central Brazil: Assessment of prevalence and vaccination coverage

Cited by 8 publications

References 20 publications

Hepatitis B: Knowledge, Vaccine Situation and Seroconversion of Dentistry Students of a Public University

Hepatitis B: Knowledge, Vaccine Situation and Seroconversion of Dentistry Students of a Public University

Prevalence of hepatitis B and D virus infection in a district of Mato Grosso, bordering Amazonas and Rondônia states

Implementation and Impact of HAV and HBV Vaccination Programs in South America

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