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However, when asked about a BCSIR scientist's comment that a new Covid-19 strain - similar to the one recently found in the UK - was detected in Bangladesh, he said, "We are still working on it."

The UK and South Africa recently discovered new Covid-19 strains in their domestic cases.

"The variants were found using genome sequencing techniques that analyse the structure of the virus and discern mutations," William A Haseltine, a former professor at Harvard Medical School and Harvard School of Public Health, said.

"These genome sequencing techniques were regularly used worldwide at the start of the pandemic when we knew less about the virus."

"Genome sequencingis essentially determining the order of chemical 'bases' of a DNA molecule. Scientists use these sequences to identify genes, regulatory instructions, or in the case of COVID-19, mutations to a virus," Haseltine said.

"We will have to step up genome sequencing in the US and worldwide. And then new variants must be identified and isolated. Else, we may be looking at a very long year," he maintained.

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