Crossword clue: an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds

The most common answer is ornithosis (10 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

ornithosis 10 letters wn-def

an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds

psittacosis 11 letters wn-def

an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds