Serologic assessment of yellow fever immunity in the rural population of a yellow fever-endemic area in Central Brazil
Rev. Soc. Bras. Med. Trop
;
46(2): 166-171, Mar-Apr/2013. tab, graf
Article
in English
| LILACS
| ID: lil-674652
ABSTRACT
Introduction The yellow fever epidemic that occurred in 1972/73 in Central Brazil surprised the majority of the population unprotected. A clinical-epidemiological survey conducted at that time in the rural area of 19 municipalities found that the highest (13.8%) number of disease cases were present in the municipality of Luziânia, State of Goiás. Methods Thirty-eight years later, a new seroepidemiological survey was conducted with the aim of assessing the degree of immune protection of the rural population of Luziânia, following the continuous attempts of public health services to obtain vaccination coverage in the region. A total of 383 volunteers, aged between 5 and 89 years and with predominant rural labor activities (75.5%), were interviewed. The presence of antibodies against the yellow fever was also investigated in these individuals, by using plaque reduction neutralization test, and correlated to information regarding residency, occupation, epidemiological data and immunity against the yellow fever virus. Results We found a high (97.6%) frequency of protective titers (>110) of neutralizing antibodies against the yellow fever virus; the frequency of titers of 1640 or higher was 23.2%, indicating wide immune protection against the disease in the study population. The presence of protective immunity was correlated to increasing age. Conclusions This study reinforces the importance of surveys to address the immune state of a population at risk for yellow fever infection and to the surveillance of actions to control the disease in endemic areas. .
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Index:
LILACS (Americas)
Main subject:
Yellow Fever
/
Yellow fever virus
/
Endemic Diseases
/
Yellow Fever Vaccine
/
Antibodies, Neutralizing
/
Antibodies, Viral
Type of study:
Screening study
Limits:
Adolescent
/
Adult
/
Aged
/
Aged80
/
Child
/
Child, preschool
/
Female
/
Humans
/
Male
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Rev. Soc. Bras. Med. Trop
Journal subject:
Tropical Medicine
Year:
2013
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade de Brasília/BR
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