GENEVA: The World Health Organization’s chief scientist warned that even as numerous countries start rolling out vaccination programs to stop COVID-19, herd immunity is highly unlikely this year.
Scientists typically estimate that a vaccination rate of about 70 per cent is needed for herd immunity, where entire populations are protected against a disease. But some fear that the extremely infectious nature of COVID-19 could require a significantly higher threshold.
WHO, however, said that most of the recent spikes in transmission were due to “the increased mixing of people” rather than the new variants.
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