From VOA Learning English, this is the Health and Lifestyle Report.Not many people consider a bacterium that makes millions of people sick ... a friend. But scientist Roy Curtiss does."Yeah, I'm always looking for new uses for a bug that most people think is an enemy -- it's my friend. And I would like to make it your friend -too."Roy Curtiss is a microbiologist at the Biodesign Institute at Arizona State University in Tempe, Arizona.He uses the word ‘bug,' a common expression for a germ or virus, when talking about Salmonella bacteria.Mr. Curtiss studies Salmonella and thinks it "gets a bad rap."In other words, many people only have bad thoughts when they hear the word, "Salmonella."Salmonella is the most common bacteria to harm, or contaminate, food. It is found in undercooked meats, eggs and milk.Salmonella can cause a higher than normal body temperature and pain in the abdomen. The person may feel sick, throwing up whatever is in the stomach.