Human Health and Diseases
Disease, vector,and transmission
- A disease is a particular abnormal, pathological condition that affects part or all of an organism. It is often construed as a medical condition associated with specific symptoms and signs.
- In humans, disease is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person afflicted, or similar problems for those in contact with the person.
- A symptom is a sensation or change in health experienced by a patient e.g., fatigue, pain, nausea, etc.
- Pathogen (pathos-disease, gen-causing) refers to an organism that causes certain diseases in animals and plants, e.g., bacteria, virus, fungi, etc.
- Vectors are the carriers that do not cause disease themselves but transmit the disease causing pathogens from infected person to a healthy person, e.g., female Anopheles mosquito is the vector of malarial pathogen, Plasmodium.
Fig. Ways by which pathogen causes disease.
Fig. Classification of diseases.
Transmission of diseases:
Fig. Transmission of diseases.
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