bacteria

Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals 

The food product itself supplies the food and water needed for bacterial growth. Most seafood products provide an abundance of food and water for growth. ... By controlling nutrients, water, temperature and time, air, acidity, and salt, you can eliminate, control, or reduce the rate at which bacteria grow.

Wash your hands before eating, or touching your eyes, nose or mouth.
Wash your hands after touching anyone who is sneezing, coughing or blowing their nose
Don't share things like towels, lipstick, toys, or anything else that might be contaminated with respiratory germs.