Vaccines ‘almost certainly less effective’ against B1.617.2 transmission: Expert

The vaccines being administered to protect against Covid-19 are “almost certainly less effective” against preventing the transmission of the B1.617.2 variant first identified in India, a leading UK scientist who advises the country’s vaccination programme said on Saturday.

Professor Anthony Harnden, from the University of Oxford who is the deputy chair of the Joint Committee on Vaccination and Immunisation (JCVI), said it was important to approach the easing of lockdown in England with “utmost caution” as it remains unclear exactly how much more transmissible the variant detected in India is.

But he reiterated that there is no evidence so far of increased severity of illness or that the particular mutation of the coronavirus evades the vaccine.

“The vaccines may be less effective against mild disease but we don’t think they’re less effective against severe disease. But in combination with being less effective against mild disease, they’re almost certainly less effective against transmission,” Prof. Harnden told the BBC.

“We don’t know how much more transmissible it is yet. All the evidence so far suggests there is no evidence of increased severity of illness or that it evades the vaccine. So, at the moment, on the basis of the evidence we are doing the right thing, coolly, calmly continuing with Monday, but keeping everything under review,” he said, in reference to the next stage in the easing of lockdown that begins in England from Monday.