Transmission of diseases AS Biology Unit 2 OCR

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  • Created by: Alex
  • Created on: 21-05-11 15:20

In order to cause disease a pathogen must

  • Travel from one host to another
  • Get into hosts's tissues
  • Reproduce
  • Cause damage to host's tissues

Most common forms of transmission
Means of vector
Physical contact
Droplet infection

Transmission Of Malaria
Malaria is spread by a vector

  • The host has malaria, a mosquito will sucj the parasite gametes into its stomach
  • the gametes fuse and the zygotes develop in the mosquitos stomach
  • Infective stages are formed and these move to the mosquitos salivary glands
  • When the mosquito bites someone, it uses it's saliva as an anticoagulant os it can drink the blood
  • This saliva conatains the infective stage of the parasite
  • In the human host, the infective stage enters the liver and multiplies before…


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