More than 1,500 cases of mouse fever were registered in Russia. The patients were identified in the regions of Nizhny Novgorod and Saratov, Tatarstan, Bashkortostan and Udmurtia, according to the media. In autumn, the risk of infection may increase due to the fact that rodents approach housing. You can catch the infection even without direct contact with mice - just inhale dust with particles from their dried secretions, virologist Anatoly Altstein told the section. You should be especially careful near haystacks and in areas where wild rodents live. Symptoms include high fever, weakness and poor health, and in some cases blood may appear in the urine.