Home FEATURED NEWS Delhi, Mumbai & Chennai infection rates dip below 1, India’s overall R value now at 1.16

Delhi, Mumbai & Chennai infection rates dip below 1, India’s overall R value now at 1.16

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Delhi, Mumbai & Chennai infection rates dip below 1, India’s overall R value now at 1.16

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Municipal health workers screen residents for Covid-19 at Dadar in Mumbai, on 25 July 2020 | Mitesh Bhuvad | PTI
Municipal health workers screen residents for Covid-19 at Dadar in Mumbai, on 25 July 2020 | Mitesh Bhuvad | PTI


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New Delhi: India’s effective reproduction number ‘R’ for Covid-19 — a key parameter to measure the rate of infection — has reduced to 1.16 this week from 1.17 last week, with R of major metros Delhi, Mumbai and Chennai dipping below 1.

The R value went up to 1.19 on 7 July from 1.11 around 26 June, just a week after ‘Unlock 2’ kicked in. Around 13 July, the R had decreased to 1.11 and then on 20 July, it increased again to 1.17.

All the calculations have been made by Sitabhra Sinha, a researcher at the Institute of Mathematical Sciences in Chennai.

An epidemic is considered to have been arrested when the R value remains below 1 consistently.

As of Tuesday, India has recorded 18,55,745 Covid cases and 38,938 deaths.

Significance of R

R and R0 (basic reproduction number) are an estimate of the number of people one patient can infect.

R0 is calculated at the beginning of the epidemic when the entire population is assumed to be susceptible to the disease. The ‘R’ changes with time, and takes into account that some individuals are protected from the disease — either because they have developed immunity or because of social distancing and other measures.

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