1 / 27

Vectors

Vectors. By Sacy Bynoe. What are vectors?. Vectors are small organisms or animals that bring diseases to the body. They act as a reservoir from which pathogen can be transmitted diseases to the host. How do they transmit diseases?. A vector transmit diseases by: 1. Picking up the pathogen

serafina
Download Presentation

Vectors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Vectors By Sacy Bynoe

  2. What are vectors? • Vectors are small organisms or animals that bring diseases to the body. • They act as a reservoir from which pathogen can be transmitted diseases to the host.

  3. How do they transmit diseases? • A vector transmit diseases by: • 1. Picking up the pathogen • 2. Carrying it in their bodies • 3. Injecting it into the host while feeding (mosquitoes) or landing on food (houseflies), which the host then eats.

  4. Mosquito as a vector

  5. The life cycle of a mosquito • The mosquito goes through complete metamorphosis, i.e. it goes through all four stages: • Egg • Larvae • Pupa • Adult

  6. What happens at each stage

  7. Eggs • The eggs are laid one at a time on still water and left to float.

  8. Larva • After about 48 hours, eggs are hatched into larva. • They live in water, and grows siphons for breathing. • They start feeding and growing, shedding their skin as they increase in size.

  9. Pupa • At this stage it does not feed, and it rests. • The larval tissues reorganize to form adult tissues and the adult is formed. • It takes approximately two days for the adult to develop.

  10. The adult/ imago! • After the pupal skin splits and the imago immerges, it rests on the water and allows itself to be dried. • At this stage the vector can transmit diseases.

  11. The cycle

  12. Diseases caused by mosquitoes

  13. Dengue fever • Dengue fever is transmitted by the female aedes aegypti mosquito. • The pathogen is injected in the body when feeding. • Sypmtoms include: • Backaches • Chills • Painful eyes

  14. Malaria • This is transmitted by the anopheles mosquito. • It is caused when the mosquito inject the malaria parasite sporozites in the body, and the parasites travel through the blood stream and affect the body. • Symptoms include: • Headaches • Nausea • Vomiting

  15. Houseflies as a vector

  16. The life cycle of houseflies • Mosquitoes go through complete metamorphosis

  17. What happens at each stage

  18. Eggs • Eggs are laid in decaying material and a female can lay up to 150 eggs.

  19. Larva • Within a day, eggs are hatched into larva/ maggots. • They are legless and white n feed from the surroundings where they hatched

  20. Pupa • Larva develops to pupa after pupating in a dark region. • It develops a hard brown shell which protects it while developing.

  21. Adult • The pupa fully develops legs and wings and immerges as a fly!

  22. Life cycle

  23. Diseases caused by flies

  24. Typhoid fever • This is transmitted by infected flies to the host. • It is caused by salmonella typhi. • Symptoms include: • Loss of apetite • Lethargy • Pain in the body

  25. Cholera • This is caused by a fly transmitting the bacterium vibria cholerae. • Symptoms include: • Excessive thirst • Dry mouth • Sunken eyes

  26. Summary • Vectors transmit pathogenic diseases. • The transmission of these diseases can be limited if the breeding of the vectors are stopped or the destruction of them developing during metamorphosis.

  27. The End

More Related