A breakthrough case of COVID-19 occurs when a person contracts COVID-19 at least two full weeks after the final dose of the vaccine. The Centers for Disease Control and Prevention tracks only breakthrough cases that result in hospitalization or death, as these incidences are both serious and very rare.
The Centers for Disease Control and Prevention is recommending the Biden administration halt flights of Afghan evacuees from military bases overseas to the U.S. for at least 21 days following a measles vaccination, according to two people with direct knowledge of the matter.
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