ICMR Director General said some studies have suggested that antibodies last for three months while some others said they may last in the body for up to five months also.
A trial has shown that plasma therapy does not reduce mortality or prevent progression of COVID-19.
These 51 cases were detected from over 45,000 samples sequenced so far in the country.
The CoWIN portal will be made available in Hindi and 14 regional languages by next week, while 17 more laboratories will be added to the INSACOG network to monitor the variants of COVID-19, the health ministry said on Monday.
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