What are the Harmful Activities of bacteria ?

Answer : There are many harmful activities of bacteria:…
  • There are many harmful activities of bacteria:
    • Food poisoning
    • Spoilage of food
    • Destruction of domestic articles
    • Reduction of Soil fertility
    • Denitrification
    • Biowar/Bioterrorism

Food poisoning:

  • Bacterial toxins present in food causes food poisoning.
  • This leads into nausea, vomiting, abdominal discomfort diarrhea and even death.
  • The food poisoning bacteria are Clostridium botulinum, Salmonella enteritis, Staphylococcus aureus etc.

Spoilage of food

  • Souring of milk, rotting of vegetables and meat are caused by many saprotrophic bacteria.

Destruction of domestic articles

  • Spirochaete cytophaga cause cellulose degradation thereby destroying textiles, wooden articles and canvas.

Reduction of Soil fertility

  • Denitrifying bacteria like Thiobacillus denitrificans, Micrococcus denitrificans, Pseudomonas aeroginosa convert soil nitrates and ammonia into free nitrogen and thus reduce the soil fertility.


  • The denitrifying bacteria decompose nitrogen compound into free nitrogen.


  • The improved variety of infective agents (bioweapons) are widely been used as an agent of effective weapon of bioterrorism.
  • The antibiotic resistant microorganisms like Bacillusanthracis are being produced at large scale and when these are released at strategic locations, they cause acute infection of anthrax.
  • The spores of B. anthracis can be produced and stored in a dry from keeping them vaible for decades in storage or after release.
  • An attack with bioweapons (antibiotic resistant strains mould) leads to spread of communicable diseases like anthrax and plague etc.
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