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Human Health and Diseases

  • Disease is characterised by various signs and symptoms.

Infectious diseases
  • It spreads through infectious agents that include bacteria, viruses, protozoans and fungi.
    • Bacterial diseases
      • Typhoid fever: Salmonella typhi; Widal test is used for confirmation of typhoid
      • Pneumonia: Streptococcus pneumoniae and Haemophilus influenzae; it infects the alveoli of lungs
      • Other examples include dysentery, plague, diphtheria
    • Viral diseases
      •  Common cold: Spreads through Rhino viruses
  • Protozoan diseases
    • Malaria: Pathogen is Plasmodium; malarial parasite requires two hosts: humans and female anopheles mosquito; malarial parasite reproduces asexually in the human host while in the mosquito host it reproduces sexually
    • Amoebiasis (a…

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