You've had quite a few examples of how bacteria can be beneficial and how they play an essential role in keeping balance in the environment and in humans. Now let's discuss the bad news!

Bacteria can disrupt homeostasis in your body by making you sick! Any substance that causes disease is called a pathogen. Your body reacts to these pathogens to try and maintain homeostasis and certain symptoms will appear as your body tries to get back on track. Your body may try to get rid of the pathogen and you will want to vomit or may have diarrhea. Having a fever is common, too.

Below is a chart of common diseases caused by bacteria and the symptoms of the disease.

Bacterial Infection	Various Symptoms
Strep Throat	Swollen glands, fever, sore throat
Tooth Decay	Sensitive teeth, destruction of tooth enamel
Meningitis	Headache, stiff neck, high fever
Lyme Disease	High Fever, fatigue, joint pain, 'Bulls-Eye' Rash at the site of tick bite
Tetanus	Severe muscle spasms, muscle paralysis, death
Salmonella	Watery or bloody diarrhea, stomach cramps, sometimes vomiting or fever

Preventing the Spread of Disease:

Wash Your Hands!!
Cover your mouth when you cough.
Don't put objects like fingers, pens, etc. in your mouth.
Thoroughly cook meat.
Keep work areas in the kitchen clean.