Hantavirus was detected at Yosemite National Park and therefore, some 100 employees at the park were tested for the same on Wednesday, a new report has uncovered. Though, the park has some 2,500 employees and the health testing is a pilot program for all of them.

The tests were conducted on a voluntary basis, for it was found that the virus had affected some nine people previously. As per the findings, they were summer visitors and had stayed in tent cabins at the park.

The virus that is transmitted as a result of exposure to infected deer mice had even killed three of them. This time, during the tests, a questionnaire was given to workers, following asking them to give blood. All the worker participants had been asked about their living habits, work habits and the type of traini9ng they had, in the questionnaire.

Besides, they were also asked about their residential places. The aim is to find out who all are infected, but have not been showing any symptoms. "It would be really important to know, for any health official, to really understand is that just a small portion of the total number", said the Santa Clara County Public Health Officer Dr. Marty Fenstersheib.