Abstract
Described are two cases within the same household that were involved in an outbreak of measles in Niterói, RJ. Measles diagnosis was confirmed serologically by specific IgM detection in Case 1 (classic measles) who was unvaccinated, and rising measles specific IgG in the absence of IgM in Case 2 (mild modified measles) who had a history of two vaccinations with measles-containing vaccines. Measles virus was detected by reverse transcriptase polymerase chain reaction (RT-PCR) in saliva samples from both cases. The nucleic acid amplified by RT-PCR was sequenced and showed identical measles sequence in the two cases. This study highlights the difficulty of diagnosing nonclassical measles infection on clinical and serological grounds, and the usefulness of PCR for viral RNA sequencing from noninvasive specimens for confirming epidemiologic links.
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