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Many public health experts were opposed to a boosters-for-all approach. The new variant is changing some minds.

As recently as last week, many public health experts were fiercely opposed to the Biden administration’s campaign to roll out booster shots of the coronavirus vaccines to all American adults. There was little scientific evidence to support extra doses for most people, the researchers said.

The Omicron variant has changed all that.

Scientists do not yet know with any certainty whether the virus is easier to spread or less vulnerable to the body’s immune response. But with dozens of new mutations, the variant seems likely to evade the protection from vaccines to some significant degree.

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Vaccines are finally available in many African countries, but some people there, as well as in South Asia, are wary of taking them.

JOHANNESBURG — The detection of the Omicron variant in Africa signals the next stage of the battle against Covid-19: getting many more people inoculated in poorer nations where vaccines have been scarcest in order to deter new mutations from developing.

But while world leaders sometimes talk about this as if it were largely a matter of delivering doses overseas, the experience of South Africa, at least, hints at a far more complex set of challenges.

Like many poor countries, South Africa was made to wait months for vaccines as wealthier countries monopolized them. Many countries still do not have anywhere near enough doses to inoculate their populations.

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