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J&J Jab Efficacy; Delta Now 83% of New U.S. Cases: Virus Update

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WATCH: Three members of South Africa’s soccer squad and a rugby coach tested positive for Covid-19 in the Olympic Village.(Source: Bloomberg)
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One dose of Johnson & Johnson’s Covid-19 vaccine is much less effective against the delta and lambda variants than against the original strain of the virus, the New York Times reported, citing a study that hasn’t been peer reviewed yet. Delta now makes up 83% of all sequenced cases in the U.S., up from 50% in early July, health authorities said.

A spokesman for U.K. Prime Minister Boris Johnson insisted that the country’s self-isolation rules aren’t optional following some mixed messaging from a government minister.