Dr Samir suggests genome sequencing of more samples

With an eye to finding out the dominant strain and local mutation of the novel coronavirus, Prof Dr Samir Kumar Saha, Executive Director of Child Health Research Foundation (CHRF), has laid emphasis on the need to genome-sequence more samples of the microbe.

The researcher, who came in the limelight following the genome sequencing of novel coronavirus for the first time in Bangladesh, said in an interviews that the sequencing of a good number of samples will help develop an effective vaccine for the country’s dominant strain and other strains of the coronavirus in the future.

A CHRF team, led by scientist Dr Senjuti Saha, also daughter of Prof Samir Saha, unveiled the whole genome sequencing of novel coronavirus (SARS-CoV-2) for the first time in Bangladesh on May 12 last. The entire sequencing work was conducted at the CHRF laboratory in Dhaka.

The foundation has an aim to sequence more samples from different locations of Bangladesh to better understand the spread and transmission patterns of Covid-19 in the country.

“We’ll conduct more research works on it. Though we’re a small organisation and working with a small machine, our ambition is very high,” said Prof Samir Saha, also a professor at the Microbiology department of Dhaka Shishu Hospital.

Talking about the recent success, he said they sequenced the coronavirus sample while going to conduct Covid-19 test after the government asked their foundation to do so as part of ramping up coronavirus testing gradually in the country.

“The genome sequencing of coronavirus is our byproduct. That means we did it in extra time while doing another work. We work with the government though we’re a private organisation. When the government expanded Covid-19 testing gradually, we were also given the responsibility to conduct testing,” he said.

Then the CHRF started getting many samples of different places and was sending the reports to the government after those were tested. “At the same time, we preserved some specimens. It’s also our responsibility,” he added.

The CHRF got the sample, which was sequenced, from a person on April 18, said Dr Samir without giving further details about the person.

Mentioning that no foreigner is involved in the genome sequencing of coronavirus, he said the Covid-19 sequencing team is comprised of young Bangladeshi researchers. Some of the team members have just completed PhDs, while some others are pursuing PhD or will go for PhD courses, he said.

Where did it come from?

The CHRF executive director said though they could not concentrate on the study yet to find out the place where from their sequenced strain entered Bangladesh, they think this virus might have come from the United Kingdom.

“Until now, we think this virus came from the United Kingdom. We’re almost sure about it. But the same strain was seen in Russia, Taiwan and Saudi Arabia,” he said.

Putting emphasis on analysing more samples, the eminent microbiologist said, “When we’ll sequence more samples, we can know the names of the other countries alongside the UK, where from the viruses entered Bangladesh. Everything (finding) is important here. We can also know whether the virus mutates after entering our country and if the mutations improve our situation or deteriorate it.”

Finding a suitable vaccine  

Dr Samir Saha said he thinks if even Bangladesh gets a vaccine quickly it would not be before the end of this year or the early next year.

“But we don’t know how many viruses will mutate by this time. If we can sequence some 100 strains, we would be able to know more. If we can sequence a larger number of strains, it would be better,” he said.

“If we do so, then we’ll be able to understand which vaccine will be effective for the virus in our country or whether the vaccine will work against one virus or all viruses in our country. We can say which virus is dominant in our country,” he added.

Citing an example over changing a vaccine against a virus in the course of time, the scientist said the vaccine for influenza is modified in almost every year with the change of this flu virus in the USA.

But the same vaccine is used for years in Bangladesh as it is not unknown what type of influenza is there in the country, Prof Samir added.

He, however, said if all work together then it will be clear which vaccine is needed for influenza in Bangladesh.  

(Source: UNB)