Four Oregonians have tested positive for COVID-19 after being vaccinated against the disease, Oregon health officials disclosed Friday.

The Oregon Health Authority said two of the cases were in Lane County and two were in Yamhill County.

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Two of the cases were found during routine surveillance testing. The other two appear to be connected. OHA officials did not specify which two.

“This is a serious but not surprising development,” OHA director Patrick Allen said.

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These re-infections, called “breakthrough infections,” are infections that occur more than 14 days after receiving the second dose of vaccine.

Given the effectiveness rate of the two vaccines —95% for both Pfizer-BioNTech’s

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