The CSSE confirmed there were 315,154 COVID-19 cases in Pima County by Feb. 28.
There were 4,292 fatalities, equalling 1.4 percent of Pima County's COVID-19 patients.
More than 50 percent of US citizens are considered fully vaccinated against COVID-19, nearing the target for "herd immunity." Herd immunity happens when enough of the population has become immune to the virus from previous infection that it effectively protects those who are not immune.
"The number of people who are immune to the coronavirus is increasing every day," professors David Dowdy and Gypsyamber D'Souza said in an interview.
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Anegam• Charco• Summerhaven• Willow Canyon• Corona De Tucson• Green Valley• Valencia West• Pimaco Two• Arivaca• Ko Vaya• Ali Chukson• Sells• Rincon Valley• Picture Rocks• Ali Molina• Ak Chin• Santa Rosa• Vail• Elephant Head• Casas Adobes• Sahuarita• Ventana• City of South Tucson• Pisinemo• Ajo• Haivana Nakya• Nelson• Nolic• Three Points• Ali Chuk• Littletown• Chiawuli Tak• Tucson Estates• Arivaca Junction• Why• Rillito• Comobabi• Gu Oidak• Topawa• Catalina Foothills• Flowing Wells• Cowlic• Town of Oro Valley• Summit• South Komelik• Catalina• Tanque Verde• Avra Valley• Wahak Hotrontk• South Tucson City• San Miguel• Drexel Heights• Maish Vaya
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