Delhi is on track to achieving herd immunity, sero-survey indicates

The latest Delhi survey started on January 11 and detected the highest ever seroprevalence of antibodies against the virus. The number rose from 25.5% in September to over 50% now.

Speaking to Indian Express, Dr. Shobha Broor, the Head of Microbiology at AIIMS, stated that the survey reveals a large number of asymptomatic infections in Delhi, which is on track to achieving herd immunity.

In one unnamed Delhi district, the prevalence of antibodies was as high as 58%. This confirms the asymptomatic infection theory since the actual number of reported cases has been steadily declining.

Pune is the only other city that has recorded more than 50% seroprevalence of COVID-19 antibodies. In most other parts of the country, the numbers average between 30% and 40%.

Dr. Broor said that the number of individuals with antibodies may reach 70% in the next round of survey going by the current growth rate. This generally has a negative effect on the rise of new infections, so COVID-19 cases should decline as a consequence.

However, antibodies against the virus are temporary, so that doesn't preclude individuals from vaccinating themselves against the virus.

The Indian Government's serological surveys are a potent tool in determining the course and severity of the deadly pandemic.

Analysis of large enough sample sizes, such as this one, provides invaluable insights to scientists and medical professionals and helps them devise a viable strategy to contain the spread of the virus.

Studies like this are vital to formulating an effective vaccination plan.