Source: United States & Canada – South China Morning PostThe US Food and Drug Administration on Wednesday authorised booster doses of the Covid-19 vaccines from Moderna Inc and Johnson & Johnson, and said Americans can choose a different shot than their original inoculation as a booster.The decision paves the way for millions more people in the United States to get the additional protection with the highly contagious Delta variant of the virus causing breakthrough infections among some who are fully vaccinated.The agency previously authorised…Read More