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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Viral infection 3 letters:

FLU: Common viral infection
FLU: Viral infection
POX: Contagious viral infection
ANTIBIOTIC: Bacterial infection treater (which is useless for viral infections, though, just FYI)
COMMONCOLD: Non-threatening viral infection