Geneva, Dec 22 (IANS): Despite a number of mutations so far of the Covid-19, none of them, including the new mutant variant found in the UK, has made a significant impact on the susceptibility of the virus to any of the currently used therapeutics, drugs or the vaccines under development, according to World Health Organization (WHO) experts.

Addressing a briefing here on Monday, WHO Chief Scientist Soumya Swaminathan said the novel coronavirus has mutated at a much slower rate than the influenza virus, the latter having required that its vaccine strains be reviewed and revised each year based on the circulating strains prevalent that year, Xinhua news agency.

"So far, even though we've seen a number of changes, a number of mutations, none has made a significant impact on either the susceptibility of the virus to any of the currently used therapeutics, drugs or the vaccines under development," she said.

The WHO chief scientist emphasized that it was important to continuously monitor what's happening to this virus, with the focus on bringing transmission down and getting it as low as possible.

"Because the more viruses you have in circulation, the more chances of mutation and the more such variants that can arise. The bottom line here is to keep the virus transmission low and keep circulation low.

"Don't allow it to get out of hand and spread in the population. That way, we can keep the mutations down," Swaminathan added.

Meanwhile, Mike Ryan, executive director of the WHO's Health Emergencies Program, said that even with the latest UK variant, "there's zero evidence at this point that there's an increase in severity associated with this disease".

He reiterated that no variants have yet established themselves as "having any higher level of severity, or invading our diagnostics, or hiding from vaccines, or the effectiveness of vaccines".

The UK on December 14 reported to the WHO of the new variant that has been associated with an increase in R0, which is the number of people that one infected individual transmits the virus to, from 1.1 to 1.5.

"That just put the barrel up a little bit; in some senses, it means we have to work harder," said Ryan.

"Even if the virus has become a little bit more efficient in spreading, the virus can be stopped."

He added that R0 around 1.5 means the virus can be stopped.

"We've had R0s much higher than 1.5 at different points of this pandemic and we have got it under control. This situation is not in that sense out of control, but it cannot be left to its own devices."

The UK variant is currently not affecting most of the Covid-19 diagnostic tests either, according to Maria Van Kerkhove, technical lead on COVID-19 response at the WHO Health Emergencies Program, as most of the tests are looking at multiple targets within the genome.

But very few tests that have only looked at a single target may be impacted in detecting this particular variant, she added.

The WHO experts urged the public to keep implementing existing public health measures, including wearing masks, hand hygiene and social distancing, which have been proven to be effective in curbing the spread of the virus, including the latest variants.