1) Biologist 2) Life scientist 1) Virologist 
Microbiologist (from Greek μῑκρος, mīkros, `small`; βίος, bios, `life`; and -λογία, -logia): `micro` means `tiny` in reference to objects that typically cannot be seen with the naked eye; `bio` means life and `-logia` (or `-logy’) is the suffix for study from the classic Greek. A microbiologist studies tiny (microsc...
One who specialises in the science of microbiology. ... (05 Mar 2000) ... 
(mi″kro-bi-ol´ә-jist) a specialist in microbiology.
Type: Term Pronunciation: mī′krō-bī-ol′ŏ-jist Definitions: 1. One who specializes in the science of microbiology.
[n] - a specialist in microbiology
microbiologist Someone who specializes in the science of microbiology or the science concerned with micro-organisms.
Person who does work or research on microorganisms
noun a specialist in microbiology