The World Health Organization (WHO) on Wednesday called on rich countries to refrain from giving people booster doses of coronavirus vaccines until at least 2022, expanding an earlier plea that has largely been ignored by wealthy nations.

WHO Director-general Tedros Adhanom Ghebreyesus said nothing has changed since last month, when he called for a global moratorium on booster shots through the end of September. 

Now, he's extending the call until at least the end of the year to enable every country to vaccinate at least 40 percent of its population. ...

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