Herd immunity against Deltavariant difficult

Subject – Science and Tech

Context – Herd immunity against Delta variant difficult, shows study

Concept –

The severe outbreak of Covid in Delhi this year showed that the Delta variant can infect individuals previously infected by a different variant, highlighting the challenges of reaching herd immunity against the variant, according to an international team of scientists.
The study, published in the journal Science, on Thursday, also found that the Delta variant was 30-70 per cent more transmissible than previous lineages in Delhi.
Herd immunity is a form of indirect protection from a disease that can occur when a sufficient percentage of a population has become immune to an infection.
The concept of herd immunity is critical in ending outbreaks, but the situation in Delhi shows that infection with previous Coronavirus variants will be insufficient for reaching herd immunity against Delta.

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