IMMUNOLOGY

Detailed explanation-1: -Not all bacteria are harmful, and some bacteria that live in your body are helpful. For instance, Lactobacillus acidophilus-a harmless bacterium that resides in your intestines-helps you digest food, destroys some disease-causing organisms and provides nutrients.

Detailed explanation-2: -Only a few types of bacteria cause illness in people. An organism that’s not made up of cells causes viral infections.

Detailed explanation-3: -But infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include Streptococcus, Staphylococcus, and E.

Detailed explanation-4: -Infectious diseases can be caused by: Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis. Viruses.

Detailed explanation-5: -Most bacteria aren’t harmful. In fact, we have many bacteria on and inside our body, especially in the gut to help digest food. But some bacteria can cause infections.