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Although varicella is a vaccine-preventable disease, vaccination policy varies widely between countries and, sometimes, in the same country based on the epidemiology of varicella.1 2 The WHO’s advice is that varicella vaccination should be started in countries where varicella is a relatively important public health and socioeconomic problem; the vaccine is affordable; and high (85%–90%) and sustained vaccine coverage can be achieved.3
When developed countries introduced varicella vaccine in their immunisation programmes, the annual incidence of varicella was already less than 16/100 000 population.4 In addition, the vaccine strategy composed of a gradual increase in vaccine coverage rate from <30% to >80% over a 9-year period, resulted in a significant reduction in …
Contributors HAK performed the data analysis and writing of the manuscript. ANK performed the data collection and review of the manuscript.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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