US vaccine maker Pfizer met federal officials on Monday to push for emergency authorisation for their Covid-19 vaccine boosters.The move was controversial because World Health Organization (WHO) and US health officials had said the existing shots were enough to protect the population against the Delta variant.By allocating resources for a third dose, inequality of access to the shots would widen, given that many developing countries are still short of doses for the unvaccinated.But booster…
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