Transmission of Disease
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Transmission of Disease - Details
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🇬🇧 | 🇬🇧 |
Micro-organisms which normally inhabit the human body but do not cause disease in normal circumstances. | Normal flora |
Micro organisms that we pick up and deposit on other surfaces and more likely to cause infection. | Transient flora |
Where is normal flora found | Skin, urinary tract, and the digestive tract |
The site from where infection leaves the host to enter another host and causes disease (nose or month) | Portal of exit |
An infectious agent may be transmitted from its natural reservoir to a susceptible host in different ways. | Method of transport |
Where the pathogen enters a susceptible host. it must provide access to tissue in which the pathogen can multiple. | Portal of entry |
Contact transmission | Direct - person to person (oral, blood) indirect - contact with a infected object (sneeze tissue - fomite) |
Droplet transmisson | Large particles that travel up to 1 meter and come in contact with new host - coughing, sneezing, breathing |
Airborn transmission | Small particles created and suspended in air or carried on dust particles - from breathing, coughing, sneezing |
Vechiles | Food, water, blood, soil |
Vector | External mechanisms- flys, birds, chickens internal transmission- mosquito or flea |
Examples of portal of entry | Respiratory tract, skin, mucous membranes ,blood, gastrointestinal tracts |