Alaskaâs practice of informing travelers they needed to be checked for Covid-19 prior to coming to the state, be tested upon arrival or self-quarantine may have reduced transmission in 2020, according to a study published by the U.S. Centers for Disease Control and Prevention. Alaskaâs airport traveler testing program identified 951 cases of Covid-19 from June to November 2020, according to findings released Friday, in the CDCâs weekly Morbidity and Mortality Report. One out of 406 arriving travelers at Alaska airports tested positive for the virus, according to the study. The program âmight have contributed to Alaskaâs low incidence during the summer by reducing opportunities for community transmission at travelersâ destination locations,â said the studyâs six co-authors, who include Dr. Anne Zink, Alaskaâs chief medical officer.