What are vectors in diseases?
Vectors are living organisms that carry and transmit disease-causing microorganisms from one host to another without becoming seriously ill themselves. Most vectors are insects.
Vectors play an important role in spreading communicable diseases.
Vectors help pathogens:
Move from infected individuals to healthy individuals
Spread diseases rapidly in communities
| Vector | Disease Spread |
|---|---|
| Mosquito | Malaria, dengue, chikungunya |
| Housefly | Cholera, typhoid |
| Rat flea | Plague |
| Tsetse fly | Sleeping sickness |
Mosquitoes bite infected individuals and carry pathogens in their bodies. When they bite healthy people, the pathogens enter the bloodstream.
Example:
Female Anopheles mosquito spreads malaria.
Houseflies sit on garbage and contaminated material, then transfer germs to food and water.
The vector carries germs externally without infection inside its body.
Example:
Housefly carrying bacteria on its legs.
The pathogen develops or multiplies inside the vector.
Example:
Malaria parasite developing inside a mosquito.
Vector-borne diseases can be prevented by:
Keeping surroundings clean
Avoiding stagnant water
Using mosquito nets and repellents
Proper waste disposal
Spraying insecticides
Controlling vectors helps:
Prevent disease outbreaks
Reduce infection rates
Protect public health
Vector management is an important part of disease prevention programs.