At least 133 cases have been reported in 26 states . Groups at high risk for listeria include older adults , people with weakened immune systems and pregnant women . The virus is spread through contact with infected animals and people who are not vaccinated against it. The tainted cantaloupes were recalled last month . The outbreak is the deadliest food-borne illness outbreak in the United States since 1998 .
At least 133 cases have been reported in 26 states . The virus is spread through contact with infected animals and people who are not vaccinated against it. The tainted cantaloupes were recalled last month . The outbreak is the deadliest food-borne illness outbreak in the United States since 1998 .