An Echovirus Type 33 Winter Outbreak in New Zealand

Sue Huang, Q.; Carr, Julia M.; Allan Nix, W.; Steven Oberste, M.; Kilpatrick, David R.; Pallansch, Mark A.; Croxson, Margaret. C.; Lindeman, Jennifer A.; Baker, Michael C.; Grimwood, Keith
September 2003
Clinical Infectious Diseases;9/1/2003, Vol. 37 Issue 5, p650
Academic Journal
Echovirus type 33 (E33) is a relatively uncommon enterovirus. An E33 outbreak during the winter of 2000 in New Zealand led to 75 virologically-confirmed cases of E33 infection (2.6 cases per 100,000 individuals). Sixty-six (88%) of the 75 patients were aged <30 years, with the highest rates of infection recorded in Maori and Pacific ethnic groups. Overall, 47 (84%) of 56 patients whose cases were analyzed had either aseptic meningitis or encephalitis. Central nervous system involvement was more common after infancy (43 of 45 non-infant patients vs. 4 of 11 infants [relative risk, 2.6; 95% CI, 1.5-4.3]). Two infants died, including a neonate with fulminant hepatitis. Independent of symptom duration, neutrophil-predominant pleocytosis was detected in 17 (41%) of 41 cerebrospinal fluid specimens. Virus isolates could not be definitively typed by antibody neutralization testing but were identified as E33 by partial sequencing of the VP-1 capsid gene. The isolates were closely related to strains from Australia and Oman. Molecular typing, together with a serotype-specific E33 PCR, improved the speed and effectiveness of the outbreak investigation.


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