Most bacteria are harmless and beneficial, but others can cause infectious diseases.
Pathogenic bacteria are the ones that cause diseases.
Pathogens can infiltrate our bodies through a variety of channels, multiply, and obstruct normal vital functions, causing morphological and functional harm.
They can enter through a number of channels, including direct touch, soil, water, and the air.
They can be transmitted via skin-to-skin contact, body fluids, airborne particles, excrement, and surfaces that have been touched by an infected person.
For example - A harmful bacterium called Salmonella typhi is what gives people typhoid fever.
Typically, these infections spread to other organs by blood after entering the small intestine through contaminated food and water.