More variants but delta still dominates
A new variant of Covid-19 detected in South Africa known as B.1.1.529 has caused flight bans and a scramble to determine vaccine efficacy, but will it overtake delta as the dominant strain of the virus?
Has Delta killed the herd immunity dream?
As the Delta variant continues its global surge, experts are questioning whether the long-held goal of achieving herd immunity from Covid-19 through vaccination is still viable
Covid-19: How vaccines work against the Delta variant
The Delta variant of the coronavirus, first identified in India, is a cause for global concern with studies showing it is more contagious and resistant to vaccines than other forms of Covid