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A communicable disease is one that is spread from one person to another through a variety of ways that include: contact with blood and bodily fluids; breathing in an airborne virus; or by being bitten by an insect.
- Physical contact with an infected person, e.g. through touch (staphylococcus), sexual contact (gonorrhoea, HIV), faecal/oral transmission (hepatitis A), or droplet (influenza)
- Contact with a contaminated surfaces or objects (Norovirus), food (salmonella, E. coli), blood (HIV, hepatitis B), or water (botulism)
- Insect or animal bites capable of transmitting the disease (Malaria caused by mosquitos and Lyme disease caused by tick bites)
- Airborne, such as tuberculosis or measles.
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