Diseases Caused By Microorganisms: Types of Infections and Microorganisms

Microorganisms and Diseases in Human

The life and health of human beings is under constant threat, particularly by micro-organisms – bacteria, viruses, fungi and protozoa. These organisms invade the tissue and produce infectious disease.

Most of the maladies affecting the human race are caused by these micro-organisms. A great number of microorganisms have been identified with their biological characteristics.

With advent of modern medicine and science, diseases caused by micro-organisms, which previously were frequently responsible for deaths, have almost vanished e. g. smallpox.  Still the prevalence of disease remains high causing much ill health and absenteeism.

Infections Caused By Microorganisms

Let us know some of the most important types of different diseases caused by microorganisms in humans:


  • Streptococcal infection causing tonsillitis, scarlet fever etc.
  • Staphylococcal infection causing boils, abscesses, osteomyelitis, pneumonia, carbuncles, stye etc.
  • Whooping cough.
  • Diphtheria.
  • Typhoid.
  • Bacterial food poisoning.
  • Dysentery.
  • Tetanus.
  • Gonorrhea.
  • Syphilis.
  • Leptospirosis.
  • Tuberculosis.
  • Cholera
  • Plague
  • Leprosy
  • Anthrax
  • Chancroid.


  • Hepatitis A, B, C, E.
  • Measles
  • Rubella.
  • Mumps.
  • Chicken pox.
  • Herpes zoster.
  • Influenza virus.
  • Human deficiency virus.
  • Yellow fever.
  • Dengue.
  • Sandfly fever.
  • Various spotted fevers and mountain fever.
  • Japanese B encephalitis.
  • Lasa fever.
  • Rabies
  • polio
  • viral gastroenteritis.

Diseases Caused by Fungi

  • Pityriasis versicolar.
  • Tinea nigra.
  • Ringworm.
  • Candida albicans
  • Blastomycoses
  • Chromoblastomycosis.
  • Sporotrichosis.
  • Cryptococcosis

Diseases caused by protozoa:

  • Leishmaniases
  • American trypanosomiasis.
  • Giardiasis.
  • Toxoplasmosis.
  • Malaria.
  • amoebiasis.
  • pneumocytosis.

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