病原 びょうげん 生物 せいぶつではありませんでした
byōgembiseibutsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 病原微生物

1. Was not a pathogen.; Was not a microorganism causing disease.

Past/Perfective
Negative
Polite
Formal Register