This is the 10378th most frequent Russian word.
вакцины
Vaccines.
The word 'вакцины' is in the genitive case, implying possession or relation to the vaccine, indicating the manufacturers are associated with the vaccine.
Производители вакцины подтвердили её эффективность.
The vaccine manufacturers confirmed its effectiveness.
The word 'вакцин' is in the genitive plural form, as it is used to describe the type of vaccines being effective.
Медики советуют делать прививки от гриппа с использованием эффективных вакцин.
Doctors recommend getting flu shots using effective vaccines.
The word 'вакцины' is in the nominative plural form, serving as the subject of the sentence, talking about the vaccines being developed.