Researchers trying to make cats nonallergenic Food, vaccines could change felines By Stacey Burling, Philadelphia Inquirer Published: July 7, 2021, 3:53pm Share: Some scientists are now taking a different approach to human pet allergies. Rather than trying to change allergic humans or their environment, they're trying to change cats. Purina began the competition in the early days of the pandemic with a cat food -- Pro Plan LiveClear -- that it says can reduce the protein that most allergic people react to by 47 percent after three weeks. (Dreamstime) PHILADELPHIA — Any cat lover who has watched an allergic friend react to a beloved pet knows the dark powers that lurk in that luxurious feline fur. Within minutes, an allergic human exposed to a cat can begin sneezing and wheezing. Eyes water and itch. The misery is obvious.