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Top 10 Most Dangerous Bacterial Infections

Bacteria are often considered to be the reasons behind most of human and animal diseases. However, certain bacteria are highly beneficial to be used in medicines like streptomycin that produce antibiotics. Overall, bacteria constitute a large territory of prokaryotes. They are found everywhere, and are of various types/shapes. Here are the top 10 most dangerous bacterial infections you should be familiar with.

Most Dangerous Bacterial Infections

10. Gonorrhea

It is one of the sexually transmitted infections, caused by bacterium Neisseria gonorrhea. The common symptoms are burning with penile discharge and urination in males, and pelvic pain and vaginal discharge in the females. This infection can be highly dangerous if not treated timely. It can cause inflammation of epididymis, prostate gland, urethral stricture in men and pelvic inflammatory disease in women.

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9. Cholera

Cholera is one of the most dangerous bacterial infections. It is an infection of small intestine, which is caused by the bacterium Vibrio cholerae. Some of its major symptoms are watery diarrhea and vomiting, leading to dehydration and bluish skin. It usually spreads by eating contaminated food. One of its major treatments is oral rehydration therapy.


8. The Black Plague

The Black Plague is caused by bacteria Yersinia pestis, affecting wild rodents mainly. This infection started spreading with rats, and transmitted to other animals. This can also infect human beings. The severity of the infection can be determined from the fact that it can take life of an infected person within four days if not treated immediately.

The Black Plague

7. Tetanus

Tetanus is one of the most dangerous bacterial infections. It is identified as the prolonged contraction of skeletal muscles, and is caused by Clostridium bacteria. This bacterium usually lives in saliva, dust, soil, and mud. This tightens the muscles, can also lead to lock jaw, making it impossible to open the mouth. This can be treated with medicines.

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6. Legionnaires’ Disease

It is a severe form of pneumonia. This is caused by a bacterium named as Legionella. The bacterium mainly affects macrophages and lung epithelial cells, and keeps on dividing instantly. It usually spreads due to smokers, contaminated food, and prolonged contact with the patient. The symptoms are headache, muscle aches, ataxia, loss of appetite, confusion and other mental changes.

Legionnaires’ Disease

5. Pneumococcal Pneumonia

Pneumonia is an inflammatory lung disease and Pneumococcal Pneumonia is a sort of pneumonia. This is one of the most dangerous bacterial infections. It is caused by bacterium called streptococcus pneumoniae or pneumococcus. This infects the respiratory tract, lungs, blood, middle ear, and nervous system. it mainly appears in kids under 5 years of age, and adults over 65 years. This can be treated with antibiotics and special vaccinations.

Pneumococcal Pneumonia

4. Anthrax

Anthrax is a serious bacterial infection, caused by Bacillus anthracis. This occurs both in animals and humans. This mainly affects immune system, blood circulatory system, and nervous system, leading to death if not treated properly and immediately. Its symptoms vary from patient to patient.

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3. Typhoid

Typhoid is one of the most dangerous bacterial infections. It is caused by bacterium Salmonella Typhi and is transmitted by ingesting contaminated water or food. The disease is also named as gastric fever, abdominal typhus, enteric fever and pythogenic fever. Symptoms include weakness of body, fever, headache, diarrhea, rose-colored spots on the chest, and enlarged liver and spleen. It can be treated with antibiotics.


2. Syphilis

Syphilis is a sexually transmitted disease. This infection is caused by the bacteria Treponema pallidum. It mainly spreads due to unhealthy sexual contacts, and from infected mother to unborn baby. It initiates as a painless sore on the mouth, and keeps on developing, leading to skin eruptions, lesions, hair loss and even death.


1. Tuberculosis

Tuberculosis is one of the most dangerous bacterial infections. It is caused by the bacterium called Mycobacterium tuberculosis. It mainly affects lungs, and its mode of transfer is organs’ transplant. Some of the symptoms of the disease are high temperature, night sweats, chills, loss of appetite, weight loss and fatigue. It is curable with proper medicines and vaccines.

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