Researchers from Imperial College London have a bad news about the Covid 19. They screened 365,000 people in England over three rounds of testing between June 20 and Sept. 28 and found that rather than people building immunity over time, the number of people with antibodies that can fight Covid-19 declined roughly 26%. The conclusion: there may be a decline in the level of population immunity in the months following the first wave of the coronavirus epidemic. What this means ? Antibodies against the coronavirus fell as people recovered from Covid-19 ! The decline was largest for people age 75 and above, the study said.“This very large study has shown that the proportion of people with detectable antibodies is falling over time,” said Dr. Helen Ward, one of the authors of the study. Health experts estimate that around 70% of the population would need to be vaccinated or have natural antibodies to achieve herd immunity.
Earlier this month, Dr. Anthony Fauci, the top U.S. infectious disease expert, said expecting people in the country to obtain herd immunity is „dangerous.” “This is consistent with evidence that immunity to seasonal coronaviruses declines over 6 to 12 months after infection and emerging data on SARS-CoV-2 that also detected a decrease over time in antibody levels in individuals followed in longitudinal studies,” the researchers concluded in the study. The results also confirm earlier studies that showed that people who did not have symptoms of Covid-19 are likely to lose detectable antibodies sooner rather than those who had more severe infections.