Real Kosher Ice Cream recalled its 8-oz. soft-serve on-the-go cups, which were distributed in 20 states, including California, Colorado, New York, New Jersey and Virginia.

The U.S. Food and Drug Administration issued a warning about a bacteria that may have made some of the Jewish company’s dessert products especially dangerous for young children, frail or elderly people and anyone with a weakened immune system.

Some of the sweets were contaminated with listeria monocytogenes, which can cause high fever, severe headache, stiffness, nausea, abdominal pain and diarrhea. Pregnant women are particularly susceptible to the bacteria.

So far, two customers—one in New York and one in Pennsylvania—required hospitalization after eating the treats. 

Consumers are asked to avoid all six flavors: vanilla chocolate, razzle, caramel, parve vanilla chocolate, sorbet strawberry mango and lite peanut butter.