Four people in Oregon have tested positive for the coronavirus after receiving both doses of the Covid-19 vaccine, health officials said.
There are two cases each in Yamhill and Lane counties, the state's Health Authority said in a series of tweets on Friday. The cases are either mild or asymptomatic.
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The agency referred to the individuals who tested positive as "breakthrough cases," meaning that they got sick with the virus at least 14 days after receiving both doses.
The Health Authority said more breakthrough cases could pop up.
"Clinical trials of both vaccines presently in use included breakthrough cases. In those cases, even though the participants got Covid, the vaccines reduced the severity of illness," the agency said in a tweet.
Four people in Oregon who received both doses of vaccine test positive for coronavirus