english: Once 40-90% of the population  has received it— the precise amount varying  based on the virus— herd immunity kicks in,  and the pandemic fizzles out.
non_english: Onda kada 40 do 90 odsto populacije bude primilo vakcinu, tačan broj varira zavisno od virusa, kolektivni imunitet nastupa i pandemija iščezava.