Yes. You can catch the stomach flu by touching contaminated surfaces, so it’s a great idea to disinfect surfaces in your home after having the stomach flu—especially if you’ve had diarrhea or vomiting. The CDC recommends using a bleach-based household cleaner, as some alcohol-based cleaners can be ineffective against some viruses. If you’re making your own bleach solution, use 5 to 25 tablespoons of household bleach [5% to 8%] per gallon of water, per the CDC.