There is two types of bacteria, one kills a specific bacteria and others cover a wide variety of bacteria.

Anti-microbials can kill most microbes. These can kill viruses bacteria and other microbes on any surface

Specialized plants have been bred to be used for make chemicals to protect humans from pathogens.

The human body uses trillions of microbes. There is more bacteria living on you and in you then you have of cells.

Phytochemicals are chemicals in plants that protect them from pathogens and animals. In most cases they are in a to strong concentration for humans. in a weaker concentration can be used for humans.

Antibiotics either stop bacteria cells from replicating or causing the new bacteria cells from having a cell wall and stopping it function.

Some bacteria's have become resistance to antibiotics. this is due to people taking antibiotics for a to short period of time and over use

antiseptic surgery was founded by joseph lister and made surgery free of bacteria

Now we use anti biotics to kill bacteria. there is one problem. They are coming resistant to them meaning they don't work and can lead to people dying

Louis Pasteur discovered bacteria by investigating how alcohol cures. he discovered germ theory.

Bacteria is becoming resistant because people are using too much and stopping before they need to because they feel better.

The largest physical barrier presented to a pathogen is the skin. Cuts in the skin can allow easy entry of pathogens into the body

Another way of pathogens getting into the skin is by an insect inserting it. Pathogens also enter through the mouth and nose meaning they don't need to break the skin.

In the nose their is hairs and mucus which catch the pathogens which get moved up the nose and out.

The stomach contains acid which kills pathogens.

Some white blood cells ingest pathogens.

White blood cells make antibodies