As coronavirus mutations undercut vaccine optimism, US scientists warn of a long fight

The world could be on the verge of having two more vaccines to fight the Covid-19 pandemic, but virus variants popping up worldwide are forcing companies that make the shots to develop boosters for a disease that could remain active for years.Vaccines made by Moderna, the Pfizer-BioNTech partnership and Sinovac are already in use. Meanwhile, new studies show that two more – from Johnson & Johnson and Novavax – pack potent punches against early forms of the virus, potentially paving the way for…

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