The best replacement for varicella is herpes zoster.

The best alternatives to varicella are rated as following:
★★★★★  herpes zoster
★★★★  zoster
★★★  varicella zoster
★★  chickenpox
★★  chicken pox
★★  zostavax
★  variola
★  varivax
★  titer
★  smallpox
★  disseminated zoster
  zoster vaccine potency

Your alternative for varicella is not listed? Suggest!
Speaking about varicella, one probably shouldn't forget about mmr.

Other search terms related to varicella and their ratings are:
★★★★★ mmr
You have in mind a companion for varicella and it is not yet here? Propose!



Google Trends

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varicella
herpes zoster
zoster