The official data also showed that the Delta variant has been found in 1,689 and the Alpha variant has been detected in 947 of the 5,752 samples from Delhi processed so far.
According to Covid weekly epidemiological update by WHO, Delta variant has been found in 135 countries, Beta variant in 132 and Gamma variant in 81 countries.
With most Covid vaccines proving less effective against Delta variant, state-owned Sinopharm said its inactivated Covid shot, given widely in China, is 68% effective.
Delta is believed to be one of the factors that catalysed India's second Covid wave. Further mutations in Delta have led to other variants, leading to concerns about vaccine efficacy.
The document from the CDC outlines unpublished data that shows fully vaccinated people might spread the Delta variant, first found in India, at the same rate as unvaccinated people.
The variant is exposing the limitations of the strategy of virus elimination. Countries are no longer targeting nil cases but transitioning toward a strategy of living with the virus.
US CDC director Rochelle Walensky said they had gathered data suggesting that some vaccinated people infected with the Delta variant can transmit the virus to others.
According to data, the prevalence of Delta exceeded 75% in India as well. The other countries were Australia, Bangladesh, China, Indonesia, Israel, UK, Russia, Singapore among others.
The doctor, despite being fully vaccinated, got infected with both Alpha and Delta variants of SARS-CoV-2, and the double infection was detected in the patient in May.
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