This is the 819th most frequent Portuguese word.
vacinação
The act of administering a vaccine to provide immunity against a disease.
In this sentence, 'vaccinação' refers to the act of administering vaccines, specified as the flu vaccination.
A vacinação contra a gripe foi realizada ontem.
The flu vaccination was carried out yesterday.
Here, 'vaccinação' is used in a general sense to refer to the process or concept of vaccinating to prevent diseases.
A vacinação é importante para a prevenção de doenças.
Vaccination is important for the prevention of diseases.
In this context, 'vacinação' reflects the organized effort or program aimed at vaccinating a population, referred to as a campaign.