Natural human infections with Vaccinia virus during bovine vaccinia outbreaks
| Autor: | Carlos Eurico Pires Ferreira Travassos, João Rodrigues dos Santos, Cláudio A. Bonjardim, Paulo César Peregrino Ferreira, Eliseu Soares de Oliveira Rocha, Erna Geessien Kroon, Jaqueline Maria Siqueira Ferreira, André T. Silva-Fernandes, Jônatas Santos Abrahão, Flávia Viana-Ferreira |
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| Rok vydání: | 2009 |
| Předmět: |
Adult
Rural Population Adolescent viruses Prevalence Cattle Diseases Vaccinia virus Antibodies Viral Disease Outbreaks Serology Young Adult chemistry.chemical_compound Zoonoses Virology Vaccinia medicine Animals Humans Smallpox Poxviridae Orthopoxvirus biology Transmission (medicine) Zoonosis virus diseases Middle Aged medicine.disease biology.organism_classification Infectious Diseases Immunoglobulin M chemistry Immunoglobulin G DNA Viral Immunology Cattle Brazil |
| Zdroj: | Journal of Clinical Virology. 44:308-313 |
| ISSN: | 1386-6532 |
| Popis: | Background Bovine vaccinia is an exanthematic disease caused by Vaccinia virus (VACV). This zoonosis has been associated with several cases of bovine infection, particularly in milk herds. Farmers, milkers and their close contacts developed lesions on the hands, forearms, legs and face accompanied by fever, headache, malaise, myalgia and axillary, inguinal and cervical lymphadenopathy. VACV infections have a significant public health impact due to their occupational character, high frequency of transmission and the improper medical treatment often applied. Objectives To study natural human infection by VACV and to analyze clinical and epidemiological aspects, emphasizing the patients' immunological status. Study design Ninety-eight individuals from rural properties with bovine vaccinia (BV) outbreaks who were at risk due to contact were submitted to epidemiological and clinical studies. From these individuals, 54 sera were analyzed by serological and molecular procedures. This study was conducted in Rio de Janeiro State from September 2002 to October 2006. Results The clinical frequency of infection was 52.0%, with 57.4% ELISA and 43.0% PRNT-positive reactions. DNAemia was detected in 18.5% of the analyzed sera, and 50% of smallpox-vaccinated individuals developed symptoms. Conclusions This study confirms the high clinical frequency of human VACV infection, even among vaccinated individuals. The infection was related to detection of IgG- or IgM-specific antibodies that correlates in most of the cases with positive PRNT. The DNAemia suggests viremia during VACV natural infections. Our data indicate that patients vaccinated against smallpox may no longer be protected. |
| Databáze: | OpenAIRE |
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