Ground in the yosemite national park, two people are dead and two others have contracted a virus. health officials saying that brings the total number of infections to six. hanta virus is carried in the fecs e, urine and is a vie la of deer mice and other rodents. the centers for disease control warning 10,000 people who stayed between june 10 and august 24 could be at risk of developing hanta virus. infectious disease specialists say hanta virus has a six week incubation period and a mortality rate of 36%. more than a third of the people who get the disease will die. shortness of breath and cough which progresses to respiratory failure. we have to put the patients on mechanical ventilation, on machines to support their breathing. park officials closed them on talks saying the design made it easy for mice to nest between the walls. two epidemiologists are currently working in the park to