As Covid-19 surged last year, governments worldwide touted the hope of "herd immunity," a promised land where the virus stopped spreading exponentially because enough people were protected against it. That's now looking like a fantasy.
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Nature isnt going to solve the problem, either. Its unclear how long natural immunity gained from surviving Covid-19 will last, and whether it will be effective at fighting off new strains. Future variants, including some that could evade immunity even more efficiently than delta, raise questions about how and when this will be over.
The Delta variant of coronavirus means a higher percentage of people need to be vaccinated to prevent the spread - and do not expect life to return to normal until at least 2022.