Covid: new vaccines needed globally within a year, say scientists

Survey of experts in relevant fields concludes that new variants could arise in countries with low vaccine coverage

The planet could have a year or less before first-generation Covid-19 vaccines are ineffective and modified formulations are needed, according to a survey of epidemiologists, virologists and infectious disease specialists.

Scientists have long stressed that a global vaccination effort is needed to satisfactorily neutralise the threat of Covid-19. This is due to the threat of variations of the virus - some more transmissible, deadly and less susceptible to vaccines - that are emerging and percolating.