The 'delta' variant of COVID-19 - the version first detected in India in October last year - is capable of infecting people even after they have received both doses of the Covaxin or Covishield vaccines, according to separate studies by AIIMS (Delhi) and the National Centre for Disease Control (NCDC).
It is important to note that neither study has been peer-reviewed as yet.
The AIIMS study suggests the 'delta' variant - which others, including one by British health authorities, say is between 40 and 50 per cent more infectious than the 'alpha' version first reported from the UK - is likely behind the majority of breakthrough infections in India.
India reported 92,596 new cases COVID-19 cases and 2,219 new deaths today. The country has so far reported a total of 2,90,89, 069 cases and 3,53,528 deaths. The positivity rate - the number of positive cases identified per 100 - stood at 4.67 per cent. It was the second straight day that India reported a positivity rate below 5 per cent.
Delhi, which began 'unlocking' from Monday, reported 316 new cases in the last 24 hours, and logged 41 deaths over the same time period.
