This is the 10377th most frequent Russian word.
вакцинации
Vaccination.
In this sentence, 'вакцинации' is used in the plural nominative case to refer to the process or act of administrating vaccines collectively.
Вакцинации помогут предотвратить распространение вируса.
Vaccinations will help prevent the spread of the virus.
Here, 'вакцинации' is in the singular genitive case, referring to the concept or act of vaccination in a general sense.
В защиту вакцинации было приведено множество научных доказательств.
Many scientific pieces of evidence were presented in support of vaccination.
In this example, 'вакцинации' is in the singular genitive case following the preposition 'после', indicating when the action occurred.