WordNet records no synonym and no antonym for varicella zoster virus. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the member of the herpes virus family that is responsible for chickenpox
Synonyms, antonyms and the broader and narrower relations for varicella zoster virus come from Princeton University’s WordNet. Full sources and licences.