Covid Vaccines Still Effective Against Delta Variant

Having two doses of Covid vaccine remains the best way to protect against the Delta variant,first identified in India and now dominant in the UK,and the whole world.The Oxford-AstraZeneca jab,though initially less effective,offers the same high protection as the Pfizer-BioNTech after four to five months,the largest study of its kind suggests.But neither is as effective as it is against the Alpha variant,responsible for most UK infections last winter.