bacterial diseases for 6 January 2026

Diseases are conditions that disturb the normal structure or functioning of living organisms, producing specific signs and symptoms. Bacterial diseases are caused by pathogenic bacteria that invade the body, multiply rapidly and disrupt normal physiological processes. While many bacteria are harmless or beneficial, disease causing bacteria can affect humans through contaminated food, water, air, wounds or direct contact. 

Bacterial Diseases

Bacterial diseases are infectious diseases caused by unicellular microorganisms called Bacteria that overcome the body’s natural defenses and multiply in tissues. These bacteria may be aerobic or anaerobic, spore forming or non spore forming, and can survive in diverse environments including soil, water and living hosts. Pathogenic bacteria cause illness by releasing toxins, damaging tissues or triggering immune reactions. The time between bacterial entry and symptom appearance is called the Incubation Period, which varies across diseases such as cholera, tuberculosis and typhoid.

Bacterial Diseases List

The list of Diseases caused by Bacteria are given below:

1. Diphtheria: Caused by Corynebacterium diphtheriae, it spreads through respiratory droplets, affects the throat, forms a pseudomembrane, and can cause breathing difficulty and suffocation if untreated.
2. Whooping Cough (Pertussis): Caused by Bordetella pertussis, transmitted through airborne droplets, characterized by prolonged coughing spells, especially dangerous for infants due to breathing complications.
3. Tetanus: Caused by Clostridium tetani spores entering wounds from soil, produces neurotoxins causing muscle spasms, jaw locking, and high fatality without immunization.
4. Cholera: Caused by Vibrio cholerae, spreads via contaminated food and water, leads to severe watery diarrhea, dehydration, and electrolyte imbalance within hours.
5. Typhoid Fever: Caused by Salmonella typhi, transmitted through contaminated water and food, results in prolonged fever, abdominal pain, intestinal perforation, and systemic infection.
6. Pneumonia: Caused by bacteria like Streptococcus pneumoniae and Haemophilus influenzae, infects lung alveoli, causes fever, chest pain, breathing difficulty, and bluish discoloration in severe cases.
7. Tuberculosis: Caused by Mycobacterium tuberculosis, spreads through airborne droplets, mainly affects lungs, produces chronic cough, fever, weight loss, and blood-stained sputum.
8. Syphilis: Caused by Treponema pallidum, sexually transmitted, presents with painless ulcers, skin rashes, fever and can affect nervous and cardiovascular systems if untreated.
9. Gonorrhoea: Caused by Neisseria gonorrhoeae, transmitted through sexual contact, causes painful urination, pus discharge and infertility if untreated.
10. Leprosy (Hansen’s Disease): Caused by Mycobacterium leprae, spreads through prolonged close contact, leads to skin lesions, nerve damage, and sensory loss.