Serosurvey conducted by BMC reveals increasing seropositivity in non-slum areas of Mumbai

The serosurvey further furnished that women have more antibodies than men to fight the coronavirus.

As per a survey conducted by the Brihanmumbai Municipal Corporation, seropositivity is surging in non-slum areas but a decrease has been noticed in Mumbai's slum pockets. This result is in tandem with the high number of covid positive victims being identified daily in the non-slum areas of the city. The serosurvey further furnished that women have more antibodies than men to fight the coronavirus, the Brihanmumbai Municipal Corporation (BMC) claimed on Saturday. Reportedly, there was 37.12% seropositivity among women as compared to 35.02% in men, involved in the research.

But what is serosurvey?

Sero studies, also known as serosurveys, use serology tests to check for the presence of antibodies among the population. If the tests detect sufficiently high quantities of a specific antibody in a person, it suggests that the person has been infected in the past. Usually, these tests are conducted on a sample of the population that has been selected based on sampling techniques to ensure that the results can be scaled up to the entire population.

Who is termed as seropositive?

People showing a significant level of antibodies or other immunologic markers in their serum, are seropositive. This indicates that there has been previous exposure to the infectious agent being tested.

It was further noted, "In the survey, 41.61% seropositivity was found in the blood samples taken from municipal dispensaries in slum areas. Overall, 36.30% seropositivity was found in 10,197 blood samples collected from citizens from all 24 wards in Mumbai."

Latest serosurvey conducted using "unlinked anonymous sampling method"

The primary survey conducted in July last year, had reported 57% seropositivity in the slum areas of three wards while the survey in August had showcased 45% seropositivity, a civic official said. "The blood samples taken from private laboratories in non-slum areas showed seropositivity of 28.5% in the current survey. In the first survey conducted in July last year, this figure was 16% for three wards and 18% in the survey held in August," the spokesperson further added

The latest serosurvey hosted in March this year, was carried out using the "unlinked anonymous sampling method" with blood samples collected from those citizens who haven't had the COVID vaccination yet.

Mumbai's COVID-19 Update

On Saturday, Mumbai reported 5,867 new COVID-19 cases; the lowest tally this month. This comes in sharp contrast to the 11,206 fresh coronavirus cases identified on April 4, which is still ranked as this month's highest single-day count. April 19 onwards, the city had been observing COVID-19 cases constantly breaching the 7000-mark, however, Saturday's figures have come as a breath of relief.

In wake of the advent of the coronavirus surge, Maharashtra tightened its guidelines and the authorities are ensuring strict implementation of the issued protocols. The restrictions combined with increased surveillance may have contributed to the dip in COVID-19 numbers.

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