Following varicella vaccine introduction in Australia, coverage of greater than 80% at 2 years of age was achieved, with varicella hospitalizations reduced by almost 70%. 40% of hospitalized children were immunocompromised.  Of hospitalized children age-eligible for varicella   vaccine, 80% were unimmunized, including all cases (3) requiring intensive care.  No deaths.

[Pediatric Infectious Disease Journal. , 17 December 2012]