Means of Spread of Infectious Diseases YouTube Lecture Handouts

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Means of Spread of Infectious Diseases

How Disease Spreads? Medium of Spread - Air, Water, Contact, Vector, Body Fluid | NSO | Olympiad

How Disease Spreads?

Medium of Spread

Medium of Spread
  • Air
  • Food and Water
  • Through Contact
  • Through Body Fluids
  • Through Vectors

Airborne Diseases

Sneezing and coughing of infected person causes tiny droplets of liquid containing bacteria/virus to come out (droplet infection) .

  • Diseases that can be spread this way
    • Common cold
    • Pneumonia
    • Tuberculosis
    • Influenza
    • Measles
Airborne Diseases
Diseases That Can be Spread this Way

Food and Water Borne Diseases

Food is contaminated by pathogens when patients do not have clean habits or flies that feed on sewage sit on food. Pathogens can get into water bodies when rainwater carries excreta/sewage into them.

  • Hepatitis A
  • Cholera
  • Typhoid
Food and Water Borne Diseases

Through Contact

When the skin meets an infected person. By touching things like clothes, Bedsheet, etc. used by the infected person.

  • Rabies
  • Herpes
  • Ringworm
  • Conjunctivitis
Through Contact

Through Body Fluids

By sexual contact (STD) , through blood, semen or mother՚s milk

  • AIDS
  • Syphilis
  • Hepatitis B
Through Body Fluids

Through Vectors

An animal that spreads disease is a vector.

  • Sleeping sickness
  • Typhoid
  • Malaria
  • Dengue
Through Vectors

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