What precautions are required in case of airborne diseases such as pneumonia and the common cold?

  • A
    Avoid close contact with infected persons.
  • B
    Avoid sharing personal belongings like towels or utensils.
  • C
    Cover the nose and mouth while sneezing or coughing.
  • D
    All of the above.

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Eradication of smallpox has been possible due to the following facts except:

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Match the following diseases with their causative organisms and select the correct option.
Column-$I$ (Disease) Column-$II$ (Causative Organism)
$(a)$ Typhoid $(i)$ Wuchereria
$(b)$ Pneumonia $(ii)$ Plasmodium
$(c)$ Filariasis $(iii)$ Salmonella
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