Health officials in the United States and Canada are investigating cases of hepatitis A that are potentially liked to fresh organic strawberries, the U.S. Food and Drug Administration said.

The federal agency announced in a statement over the weekend that the strawberries under investigation were sold under the brands of FreshKampo and HEB between March 5 and April 25. Though the strawberries in question are past their shelf life, the FDA is urging members of the public who may have frozen the berries to consume later not to eat them.

The strawberries have resulted in at least 17 cases of hepatitis A in the United States, including 12 hospitalizations, it said, with 15 of the cases reported in California and one in each state of Minnesota and North Dakota.