No herd immunity in Ahmedabad, reveals 'Antibody Prevalence
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The 'antibody prevalence study' was conducted by the AMC to find out if herd immunity exists against coronavirus in Ahmedabad city, which accounts for a large share of the total 52,563 cases registered across Gujarat till now.

In a statement, the AMC asserted that at least 70 to 80 per cent people need to be infected to establish the presence of herd immunity against coronavirus in population.

"The AMC conducted COVID-19 anti-body prevalence study in the city from June 16 to July 11 to find out if any herd immunity exists against coronavirus at all.

"In all, 30,054 samples were taken from across the city having a population of 6.3 million," said Medical Officer of Health, AMC, Dr Bhavin Solanki.

"Out of over 30,000 samples, in only 17.61 per cent (5,292 persons) samples anti-bodies were found. At least 70 to 80 per cent samples need to come positive to establish the existence of herd immunity.

However, the AMC has maintained that 17.61 per cent positivity rate is not enough to prove the presence of herd immunity.

"Thus, our study has established that there exists no herd immunity in the city," he said.

Source: https://www.livemint.com/news/india/18-people-in-ahmedabad-covered-under-study-have-covid-19-antibodies-11595524422625.html
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