How deadly is India's Covid variant and is it REALLY behind explosion of cases? Scientists say 'perfect storm' fuelled nation's crisis and mutant strain just had a 'head-start' - as study shows vaccines DO work against it B.1.617 strain blamed for the raging second wave killing nearly 3,000 Indians a day and infecting 350,000 Doctors in India claimed variant is 'far more infectious and probably far more deadly' than previous strains But experts say 'perfect storm' of complacency, lack of social distancing and combination of strains to blame