Evidence available with scientists suggests there has been no mutation in the three known strains of the coronavirus that is causing the Covid-19 outbreak in India, government officials said on Friday, even as they claimed that the steps taken by authorities have helped the country slow the doubling rate of the infection to 6.2 days from three days before the announcement of a nationwide lockdown last month.
Genome sequencing of the Sars-CoV-2 virus in Indian laboratories, including in Pune’s premier National Institute of Virology, has so far found three strains of the pathogen, Raman R Gangakhedkar, head of the epidemiology and communicable disease division of the Indian Council of Medical Research (ICMR), said.
“The initial samples had a virus sequence similar to what was found in Wuhan, China (where the outbreak began in December); the second sequence was what was circulating in Iran and has similarities to the Wuhan virus; and the third strain is what has been found in people infected in the United States or the United Kingdom,” he said at a press conference.
“...this virus does not mutate fast. Now the question is which of the strains is going to be the dominant quasispecies (dominant strain) in India...it is a bit difficult to predict at this time,” he added.
Scientists isolate strains of viruses from patients to check for variations or possible mutations in a geographic area. The isolation of virus strains is the first step towards creating drugs, vaccines and rapid diagnostic kits in a country.
Several research projects are underway in India in the field of drugs and vaccine development. ICMR will soon start studying the effect of Bacillus Calmette–Guérin (BCG) vaccine in Indian population. BCG, which scientists believe could boost immunity, is a tuberculosis vaccine that has shown promise against Covid-19, according to US researchers.
At the same event, a top official of the Union health ministry said the sweeping restrictions announced to contain the infectious disease seemed to be working in India, stressing that it took it took 6.2 days for Covid-19 cases to double in the past week as against three days before the nationwide lockdown came into effect on March 25.
