Covid-19 in Delhi: Infections up, or is it more RT-PCR tests?

By: |
August 26, 2020 5:35 AM

So, are infection levels once again rising in the city — they had fallen to a low of 5.1% on August 7— or is it a change in the kind of tests being done?

Delhi’s positivity levels started falling when it began conducting more Rapid Antigen Tests (RAT). Delhi’s positivity levels started falling when it began conducting more Rapid Antigen Tests (RAT).

On Tuesday, with 1,061 people testing Covid-positive of the 11,910 tests done, Delhi recorded a positivity rate of 8.9%. The last time the capital showed a similar positivity rate was July 20 when the positivity was 8.3%.

So, are infection levels once again rising in the city — they had fallen to a low of 5.1% on August 7— or is it a change in the kind of tests being done?

Delhi’s positivity levels started falling when it began conducting more Rapid Antigen Tests (RAT). From 21.4% on June 2, when there were no RAT tests, the positivity fell to 12.8% on June 30 by when the share of RAT had climbed to 45%; and on July 31, when RAT further increased to 70%, the positivity fell to 6.3%.

Positivity levels continued to fall thereafter, but as the share of RT-PCR has started to rise again, so has the positivity. Three weeks ago (August 4-10), just a fourth of tests were RT-PCR and less than six per cent of those being tested were found to be infected. That share of RT-PCR rose to about 32-33% in the August 18-24 period, and the positivity is also up to 7.3%.

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