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Researcher Erik Foster talks in his laboratory about ticks during a tour of the Center for Disease Control laboratory Thursday, April 4, 2024, in Fort Collins, Colo. (AP Photo/David Zalubowski)
A tick is viewed atop a pencil eraser in the laboratory of researcher Erik Foster during a tour of the Center for Disease Control laboratory Thursday, April 4, 2024, in Fort Collins, Colo. (AP Photo/David Zalubowski)
Researcher Erik Foster talks in his laboratory about ticks during a tour of the Center for Disease Control laboratory Thursday, April 4, 2024, in Fort Collins, Colo. (AP Photo/David Zalubowski)
Researcher Erik Foster uses a microscope to examine a tick in his laboratory during a tour of the Center for Disease Control laboratory Thursday, April 4, 2024, in Fort Collins, Colo. (AP Photo/David Zalubowski)
Researcher Erik Foster talks in his laboratory about ticks during a tour of the Center for Disease Control laboratory Thursday, April 4, 2024, in Fort Collins, Colo. (AP Photo/David Zalubowski)
FILE - This undated photo provided by the U.S. Centers for Disease Control and Prevention shows a blacklegged tick, also known as a deer tick. Another mild winter and other favorable factors likely means the 2024 tick population will be equal to last year or larger, some researchers say. (CDC via AP, File)