People with streptococcal infections usually transmit the illness through skin contact. Mucus on the skin carries the bacteria, which can cause fever, throat or skin infections, among other symptoms. The spread of streptococcal infections can be reduced by thorough hand washing.

Salmonella is a type of bacteria that is found in the feces of people or animals, which can then infect other people or animals. These organisms can cause fever, diarrhea and abdominal cramps. Washing hands after using the restroom is a critical way to keep Salmonella from spreading.

E. coli can be transmitted through hand contact, especially during food preparation. The resulting infection often causes severe bloody diarrhea and abdominal cramps. Hand washing, especially after handling raw meats, is one of the best ways to stop the spread of E. coli.

Staphylococcus aureus is a common bacteria frequently responsible for food poisoning. It can sometimes cause nausea, vomiting, stomach cramps and diarrhea in as little as 30 minutes. To prevent from spreading through food, be sure to wash hands carefully before preparation.