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प्रश्न
List the different ways by which communicable diseases are transmitted
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उत्तर
Communicable diseases are transmitted broadly by two modes:
Direct transmission:
- Direct contact: From skin to skin. Examples: eye infection (conjunctivitis),skin diseases, etc.
- Droplet infection: From droplet of saliva or nose during cough, sneezing, speaking and spitting. Examples: Tuberculosis (TB), common cold, whooping cough, influenza.
- Contact with soil. Example: mycosis, tetanus.
- Inoculation into skin: Microbes may inoculate directly into skin. Examples: Rabies virus is inoculated by dog bite, hepatitis B virus is inoculated through contaminated needles and syringes.
Indirect transmission:
- Transmission of microbes through water and food (vehicle borne transmission). Examples: typhoid, cholera, polio, food poisoning, diarrhoea etc.
- Transmission by blood. Examples: Hepatitis B and malaria
- Transmission of microbes by an arthropod/living carrier (vector borne). Examples: malaria, dengue are transmitted by mosquito, typhoid, cholera are transmitted by housefly, plague is transmitted by rat flea, etc.
- Transmission through fomites: Fomites include soiled clothes, towel, cups, spoon, toys, etc. Examples: diptheria, eye and skin infection.
- Transmission through unclean hands. Examples: typhoid, intestinal parasites.
- Air borne transmission. Examples: epidemic typhus.
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