This study aimed to identify seasonal variations in the presentation of primary varicella infection in susceptible patients in Victoria (a temperate region in south-east Australia) by analysing Victorian hospital admissions data and medical locum service data from the years preceding the introduction of a universally offered vaccination, complemented by available surveillance data from the neighbouring state, of South Australia. Contrary to the conventional assumption, which is based on observations in temperate regions elsewhere in the world, we found no consistent evidence of seasonal peaks during late winter and early spring for varicella infection in Victoria. This finding may have implications for prevention in temperate regions elsewhere in the world wherever estimations of local seasonal trends have been based on international experiences.
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