4 Oregonians contract COVID-19 after full vaccination; experts say 'breakthrough' cases expected Frank Augstein/AP FILE - A nurse prepares to administer the Pfizer-BioNTech COVID-19 vaccine at Guyâs Hospital in London, Tuesday, Dec. 8, 2020. U.K. health authorities rolled out the first doses of a widely tested and independently reviewed COVID-19 vaccine Tuesday, starting a global immunization program that is expected to gain momentum as more serums win approval. (AP Photo/Frank Augstein, Pool) and last updated 2021-02-16 17:01:04-05 Oregon has become one of the first states to report people contracting COVID-19 after being fully vaccinated. The announcement is not a surprise to health officials, who remind people there is no vaccine that is 100% effective at preventing infections, and the COVID-19 vaccine can help lessen the severity of symptoms to those who contract it.