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Why Do We Fall ill?

Tutormate > CBSE Syllabus-Class 9th Biology > Why Do We Fall ill?

5 Prevention of Infectious Diseases

Principle of Prevention

  • Once someone gets a disease, the body functions get damaged and there are chances that they may never recover completely.
  • Also, treatment of any disease takes time. This means that if someone is suffering from a disease, he or she is likely to be bedridden for some time, even if they are under proper medication
  • In fact, the person suffering from an infectious disease can serve as the medium for further spread of infection to other people.
  • Hence, prevention of diseases is better than their cure.

General way of prevention of infectious disease.

  • Adopt living conditions that are not overcrowded in order to avoid exposure to air-borne microbes.
  • Safe drinking water should be order to prevent exposure to water-borne microbes,
  • It is important to ensure that the environment is clean as this will not allow mosquito breeding and help avoid vector-borne infections

Immune system

  • Immunity is a special mechanism in the body or property to fight against infectious pathogens.
  • Immune system consists of certain immune cells which produce allergies, reactions or antibodies against antigens (foreign particles) entering our body.


  • When the immune system first encounters an infectious microbe, it responds against it and then remembers it specifically.
  • So when the next time that particular microbe enters the body, the immune system responds it with greater vigour. This is the basis of the principle of immunization.


  • Vaccination is injecting the microbe we want it to vaccinate against, into the body to attain immunization.
  • This will not cause the disease but will help prevent any subsequent exposure to the infecting microbe from turning into an actual disease.
  • Wide varieties of diseases around us have numerous vaccines specific to each disease.
  • For example, BCG vaccine for tuberculosis, TAB vaccine for typhoid.


  • These are drugs, developed for treating bacterial infections and some other pathogens as well.
  • Development of drugs for viral diseases are much difficult than developing drugs for bacterial diseases.
  • Antibiotics are not effective for viral diseases that are caused by viruses that depend on a host cell for their reproduction and survival.
  • Also, they do not have their own machinery and follow host cell biochemical pathways.
  • So, the drugs which harm the virus could affect the host also.
  • However due to advancement in the medical field, many anti-viral drugs have been developed recently despite the difficulties.

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