弱毒 じゃくどくワクチンではありませんでした
jakudokuwakuchindewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 弱毒ワクチン

1. Was not a weakened vaccine.; Was not of a low-toxicity vaccine.

Past/Perfective
Negative
Polite
Formal Register