ROCHESTER, N.Y., Oct. 28 (UPI) -- At least 31 cats in four U.S. states fell ill after eating recalled cat food and experts say more cases could occur due to insufficient communication.

Louise Murray, medical director for the American Society for the Prevention of Cruelty to Animals in New York, said the lack of an official veterinary emergency network means there could be additional cases, the Rochester (N.Y.) Democrat and Chronicle reported Wednesday.

"There is no one body that has every veterinarian's e-mail and sends them out an announcement," Murray said.

The illnesses have been attributed to two varieties of dry cat food from Diamond Pet Foods of Meta, Mo., which issued a recall Oct. 3 regarding the products, which contain an insufficient amount of thiamine.

The Democrat and Chronicle said while most of the ailing cats recovered, two were euthanized.

Susan Hubbard, a veterinarian in Greece, N.Y., said cat illnesses linked to the recalled cat food were reported in New York, Delaware, Pennsylvania and South Carolina. Most were in the Rochester area.