CDPH is monitoring the recent cruise ship outbreak of Andes strain hantavirus, along with our local and national partners. None of the passengers from the cruise ship outbreak will be returning to Illinois, and the risk to Chicagoans remains very low. The Andes strain of hantavirus is the only strain known to transmit from person-to-person, and the rodents known to carry the Andes strain do not live in the United States. The state of Illinois has reported 7 cases of hantavirus since 1993; none were the Andes strain, and none were in a Chicago resident. In the U.S., hantavirus generally spreads from the droppings of the deer mouse. The best way to avoid hantavirus is to avoid contact with rodent urine, droppings, saliva, and nesting materials. If you have mice or rats in your home, clean up after them safely using gloves and disinfectant. CDPH continually monitors for 70+ different infectious diseases, including hantavirus, and coordinates with state, local, and national public health partners to prepare for emerging infectious diseases – visit the CDPH website to learn more.