Investigation of measles IgM-seropositive cases of febrile rash illnesses in the absence of documented measles virus transmission, State of São Paulo, Brazil, 2000-2004
| Autor: | Ana Maria Sardinha Afonso, Telma Regina Marques Pinto Carvalhanas, Flávia Helena Ciccone, Eliseu Alves Waldman, Brendan Flannery |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Microbiology (medical)
Pediatrics medicine.medical_specialty Measles Vaccine Roseolovirus Infections Rubella Measles Measles virus Parvoviridae Infections Medicine Humans False Positive Reactions Seroconversion Syndromic surveillance biology business.industry Exanthema medicine.disease biology.organism_classification Virology Rash Vaccination Infectious Diseases Specimen collection Immunoglobulin M Population Surveillance Parasitology Measles vaccine medicine.symptom business Rash illness Brazil |
| Zdroj: | Revista da Sociedade Brasileira de Medicina Tropical v.43 n.3 2010 Revista da Sociedade Brasileira de Medicina Tropical Sociedade Brasileira de Medicina Tropical (SBMT) instacron:SBMT |
| ISSN: | 1678-9849 |
| Popis: | INTRODUCTION: To review measles IgM-positive cases of febrile rash illnesses in the State of São Paulo, Brazil, over the five-year period following interruption of measles virus transmission. METHODS: We reviewed 463 measles IgM-positive cases of febrile rash illness in the State of São Paulo, from 2000 to 2004. Individuals vaccinated against measles < 56 days prior to specimen collection were considered to be exposed to the vaccine. Serum from the acute and convalescent phases was tested for evidence of measles, rubella, parvovirus B19 and human herpes virus-6 infection. In the absence of seroconversion to measles immunoglobulin-G, measles IgM-positive cases were considered false positives in individuals with evidence of other viral infections. RESULTS: Among the 463 individuals with febrile rash illness who tested positive for measles IgM antibodies during the period, 297 (64%) were classified as exposed to the vaccine. Among the 166 cases that were not exposed to the vaccine, 109 (66%) were considered false positives based on the absence of seroconversion, among which 21 (13%) had evidence of rubella virus infection, 49 (30%) parvovirus B19 and 28 (17%) human herpes virus-6 infection. CONCLUSIONS: Following the interruption of measles virus transmission, thorough investigation of measles IgM-positive cases is required, especially among cases not exposed to the vaccine. Laboratory testing for etiologies of febrile rash illness aids interpretation of these cases. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|