Background: Rates of varicella have decreased substantially in countries implementing routine varicella vaccination. Immunisation is possible with monovalent varicella vaccine or a combined measles-mumps-rubella-varicella vaccine (MMRV).
We assessed protection against varicella in naive children administered one dose of varicella vaccine or two doses of MMRV. Interpretation: These results support the implementation of two-dose varicella vaccination on a short course, to ensure optimum protection from all forms of varicella disease.