So, what causes infection? We must understand what causes infection so that we may participate in infection control effectively. Infection is caused by pathogens which may otherwise be known simply as bugs! Pathogens include:
- bacteria
- viruses
- protozoa
- fungi

Transmission of disease occurs when pathogens are spread so we need to develop an understanding of how they can enter our bodies and be spread from one person to another. There are several ways this can happen.
- Airborne transmission occurs when we cough or sneeze.
- Contamination: the pathogens in human faeces may be spread via food or objects.
- Touch: pathogens my be spread by skin to skin contact such as shaking hands or kissing.
- Body Fluids: Saliva, urine faeces and blood all carry pathogens that may be transmitted through cuts or mucous membranes fom one person to another.
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