The Centers for Disease Control and Prevention says an unprecedented outbreak of the hantavirus has killed two of the six people known to have been infected when they stayed in some of the park’s cabins between June 10 and Aug. 24.
The disease is spread through the urine, droppings or saliva of infected rodents.
Symptoms usually take between one and six weeks to emerge in humans.
It’s feared that as many as 10,000 park visitors could be at risk of coming down with the disease.
Yosemite officials say a design flaw appears to have allowed infected mice to get inside the walls of the cabins.