Outbreaks of vaccine-preventable diseases in Ohio prove these illnesses are still dangerous. In 2014, Ohio experienced outbreaks of the mumps and measles. Some patients suffering from these illnesses experienced very serious complications, including deafness and decreased fertility. Chickenpox (varicella) can cause serious complications and for some children, especially those who are immune compromised, it can be life threatening. Pregnant women who contract chickenpox may miscarry or the fetus may have abnormalities, such as skin scars or blindness. Each year in the U.S., rotavirus (a virus that causes diarrhea) leads to more than 200,000 emergency room visits, 70,000 hospitalizations and 20-60 deaths.