The Delta Covid variant is the current dominant strain of the infectious virus, with its presence reported in 185 countries, as of September 21, the World Health organisation has said.

"The Delta variant now accounted for 90 per cent of the sequences submitted to GISAID with a sample collection date (between 15 June-15 September, 2021)," the global health agency said in its weekly epidemiological update on Tuesday. GISAID, which stands for Global Initiative on Sharing Avian Influenza Data, is an open-access database.

The Delta Covid variant is the current dominant strain of the infectious virus, with its presence reported in 185 countries, as of September 21, the World Health organisation has said.

"The Delta variant now accounted for 90 per cent of the sequences submitted to GISAID with a sample collection date (between 15 June-15 September, 2021)," the global health agency said in its weekly epidemiological update on Tuesday. GISAID, which stands for Global Initiative on Sharing Avian Influenza Data, is an open-access database.