Annual incidence of scarlet fever in Hong Kong remained elevated after an upsurge in 2011. Incidence increased from 3.3/10,000 children <5 years of age during 2005-2010 to 18.1/10,000 during 2012-2015. Incidence was higher among boys and was 32%-42% lower in the week following school holidays.
Keywords: GAS; Hong Kong; Streptococcus pyogenes; bacteria; bacterial infection; epidemiology; group A streptococcus; kindergarten; scarlet fever; seasonality.