21 Sep, 2020 03:15 am

Herd immunity knocking on the door of Karachi

Herd immunity knocking on the door of Karachi
COVID-19 antibodies were absent from the blood of 17 per cent of the Karachiites who had contracted the severe acute respiratory syndrome coronavirus 2 and tested positive for the viral infectious...

Dr Shamsi, who is leading the largest convalescent plasma therapy trial in the country, also believes that Pakistan, or Karachi at least, is knocking on the door of herd immunity, claiming that millions have already contracted COVID-19 asymptomatically and are immune to the infectious disease.He also claimed that within a few weeks Karachi might be able to achieve herd immunity, where transmission of the virus in the community would almost come to a halt.“Our research shows that 45 to 50 per cent of Karachiites have been infected asymptomatically, and within the next few weeks 65 to 70 per cent of the city’s population would’ve been infected, which is the minimum requirement for achieving herd immunity in the case of COVID-19.”A top infectious diseases expert said that the absence of COVID-19 antibodies in the blood of positive patients is not a big deal, saying that the lack of antibodies does not mean a person has not cleared the infection.

Also, the place where the antibodies are — blood versus the nasal cavities — may be important”.Dr Mehmood stressed that it is not as simple as only checking the antibodies in the blood to determine whether or not a person is immune.

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