Infectious diseases can also be spread indirectly through the air and other mechanisms. For example:
1. Airborne transmission
Some infectious agents can travel long distances and remain suspended in the air for an extended period of time. You can catch a disease like measles by entering a room after someone with measles has departed.
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2. Contaminated objects
Some organisms can live on objects for a short time. If you touch an object, such as a doorknob, soon after a person with an infectious disease, you might be exposed to infection. Transmission occurs when you touch your mouth, nose, or eyes before thoroughly washing your hands.
Germs can also be spread through blood products and medical supplies containing the virus or bacteria.
3. Food and drinking water
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Infectious diseases can be transmitted via food and water containing the virus or bacteria.E. coli is often transmitted through improperly handled produce or undercooked meat. Improperly canned foods can create an environment ripe for Clostridium botulinum, which can lead to botulism.
4. Animal-to-person contact
Some infectious diseases can be transmitted from an animal to a person. This can happen when an animal with an infection bites or scratches you, or when you handle animal waste. The Toxoplasma gondii parasite can be found in cat feces.
Pregnant people and people with compromised immune systems should take extra care (disposable gloves and good handwashing) when changing cat litter, or avoid it altogether.
5. Animal reservoirs
Animal-to-animal disease transmission can sometimes transfer to humans. Zoonosis occurs when diseases are transferred from animals to people. Zoonotic diseases include:
- anthrax (from sheep)
- rabies (from rodents and other mammals)
- West Nile virus (from birds)
- plague (from rodents)
6. Insect bites (vector-borne disease)
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Some zoonotic infectious agents are transmitted by insects, especially those that suck blood. These include mosquitos, fleas, and ticks.
The insects become infected when they feed on infected hosts, such as birds, animals, and humans. The disease is then transmitted when the insect bites a new host.
Malaria, West Nile virus, and Lyme disease are all spread this way.
7. Environmental reservoirs
Soil, water, and vegetation containing infectious organisms can also be transferred to people.
Hookworm, for example, is transmitted through infected soil. Legionnaires’ disease is an example of a disease that can be spread by water that supplies cooling towers and evaporative condensers.
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