A study led by The National Centre for Disease Control (NCDC) shows no presence of antibodies in the blood of 97 out of 208 people who had earlier tested Covid positive during its July sero survey. The organisation said that immune response triggered by the SARS CoV-2 may be transient in nature.
Sero surveillance shows key evidence for determining the spread of covid-19 virus.
The NCDC, which comes under the Union Ministry of Health and Family Welfare, also reported in its sero-survey that antibodies generated among Delhi’s population may be “short lived” as the city has a large population coming from places such as Noida, Gurgaon and Ghaziabad. It also indicated earlier that large number of infected individuals remained asymptomatic.
The report, prepared on July 21, has been submitted on monday to the Delhi High Court as part of ongoing hearing on testing in Delhi that includes all 11 districts.
The survey conducted using COVID KAVACH ELISA in July, tested 21,387 people, which had shown a sero-positivity rate of 22.83%. Among those examined, 208 people shared they were previously tested positive through the RT-PCR method.
The NCDC report read, only 111 of 208, i.e 53.37%, were found to be seropositive and 97 study volunteers who were tested positive by RT-PCR were seronegative. The finding corroborates with the propagated scientific reports proving that the immune response illicited by SARS CoV 2 is found to be transient in nature and need to be analysed via cohort studies.