Update: hantavirus disease--southwestern United States, 1993.

Since May 1993, the state health departments in Arizona, Colorado, New Mexico, and Utah; the Indian Health Service; and CDC, with the assistance of the Navajo Nation Division of Health, have been investigating an outbreak of acute respiratory illness related to a newly recognized hantavirus (1-5). This report updates the investigation and presents information on a recent case of hantavirus-associated respiratory disease in a resident of Nevada.