Kraft Foods, the conglomerate built on macaroni and cheese, is working on a new and unusual product line  food that is not only tasty, but kills intestinal worms.

It is not intended for sale in the United States, but is aimed at rural Asia, Africa and Latin America, where worms leave millions of children lethargic, dangerously anemic and, sometimes, passing blood.

The food is in the early development stage, and a spokeswoman said the company was not ready to say whether it would be a cheese, a pasta, a granola bar or something else. But it will incorporate deworming chemicals developed by TyraTech, a company in Melbourne, Fla., that makes safe pesticides.

The pesticides, explained R. Douglas Armstrong, chief executive of TyraTech, are derived from plant oils. He would not name the plants, but compared the idea to the power of citronella to repel mosquitoes.