With Record rise in COVID cases in Mumbai, experts believe it might be heading towards Herd immunity, so what Herd immunity is?
This is one of the most talked weapons in the fight against COVID is herd immunity. It has become crucial for India, where after the lifting of lockdown cases have seen a surge.
Herd immunity is the indirect protection against a contagious disease, either through vaccination or immunity developed through the previous infection.
In an encouraging development, an experts' report late on Tuesday pointed to Mumbai heading towards 'herd immunity' as the city recorded the lowest number of cases — 700 — in the past three months on Tuesday, officials said.
The ser-survey report prepared by the NITI Aayog, Tata Institute of Fundamental Research, and Brihanmumbai Municipal Corporation (BMC) indicate that Mumbai, which currently has a little more than 21,000 active cases, could be inching towards herd immunity. The recovery rate in Mumbai is 73 percent while the doubling rate has climbed to 69 days. So far, BMC has done over 4.85 lakh tests and the overall growth from July 20 to July 26 is 1.03 percent.
"The first round report of Sero Surveillance for Covid-19 infection in Mumbai indicates that 57 percent of slum population and 16 percent of the non-slum population have developed antibodies. The infection fatality rate is very low. Are we closer to herd immunity?" BMC's Additional Municipal Commissioner Ashwini Bhide tweeted late on Tuesday.
A BMC statement later said: "The results will be valuable to learn more about herd immunity. Although it is still unclear what level of prevalence leads to herd immunity, findings indicate at least in slums this could be attained sooner or later, if the immunity exists and persists in a significant proportion of the population."
About 57 percent respondents in Mumbai slums had been exposed to Covid-19, as opposed to 16 percent in non-slum areas, showed the sero-survey report. Sero-prevalence was marginally higher in women than men, showed the study.
The first round of the study was conducted on 6,936 people from three wards — R-North, M-West, and F-North. Higher sero-prevalence in slums could be possible due to population density and shared common facilities — toilets, water points, etc. - said the study.
