Covid-19 drugmakers are hunting for new antibodies after warnings that some treatments may prove ineffective against rapidly spreading variants of the coronavirus.

Antibody treatments — such as the one given to Donald Trump when he contracted the virus in October — are used to bolster the immune systems of patients struggling to mount their own response. Trial data suggest the drugs, also known as monoclonal antibody treatment, could also be used as a preventive measure in high-risk settings such as nursing homes...

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