Pima County has confirmed its third measles case since New Year's Eve, officials say.
It is the second measles case in Pima County in 2026. Unrelated cases have also been reported this year in Maricopa and Pinal counties.
Weeks ago the county said an individual who recently crossed the international border from Mexico into Arizona tested positive for measles. The state health laboratory confirmed the case Dec. 31, making it the only measles case reported in Pima County in 2025.
Earlier this month the county detailed a second measles case. That one involved an unidentified, fully vaccinated person who “developed symptoms after returning to Arizona from international travel,” the county said.
No details about the third Pima County case have been provided, but the county has identified locations in the city where there might have been exposure.
• El Rio Health Northwest, 320 W. Prince Rd., between 8 a.m. and 6 p.m. Jan. 21 and Jan. 22.
• Fry’s, 2001 E. Irvington Rd., between 5 p.m. and 8 p.m. Jan. 21.
• El Herradero, 2770 W. Valencia Rd., between 5 p.m and 8 p.m. Jan. 22.
Symptoms typically appear 14 days after exposure and may include fever, cough, runny nose and red eyes, followed by a rash.
Anyone exposed in Tucson on Jan. 21 should watch for symptoms until Feb. 11, and until Feb. 12 for those exposed on Jan. 22, the county said.
Measles is a viral disease that's highly contagious but preventable. Vaccination is the most effective protection, health officials say.
Measles can spread through direct contact, infected surfaces, and live in the air for up to two hours.
