Watch Out for These 9 Dangerous Bacteria That Are Harmful to Humans

11 November, 2017
Even though not all bacteria are deadly, some dangerous bacteria can jeopardize your body. They can also provoke different illnesses if not detected and treated in time. 

At the beginning of the year, the World Health Organization (WHO) published the list of the most harmful bacteria for humans. 

Among those published you can find the ones that took the most human lives.

Knowing which these are, their symptoms, and associated illnesses is important to maintain your personal and family health. The majority cause common diseases that put lives at risk if we don’t treat them.

In addition, this list also indicates the need for medical laboratories to find new antibiotics to combat each threat.

Dangerous Bacteria

1.Acineobacter baumannii

This is perhaps the most resistant bacteria at this time.

Thousands die each year due to this bacteria. After all, it creates antibodies that are resistant to drugs.

  • It starts with aggressive pneumonia accompanied by a powerful urinary tract infection.
  • As a result, finding drugs to fight this bacteria is a high priority in laboratories.

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2. Pseudomonas aeruginosa

woman fighting deadly bacteria

The attacks from this pathogen are various. Because of this, they’re sometimes difficult to identify.

  • This dangerous bacteria is related to patients with AIDS and fibrous cysts.
  • In addition, it also can begin with a simple dermatitis or by ingesting contaminated water.

In general,  its grave danger is in its capacity to reproduce in people who have AIDS.

At the same time, this tends to cause pulmonary complications and strong infections for persons who are compromised with another virus.

3. Enterobacteriaceae

This bacteria is in a family of microorganisms whose diseases basically affect the digestive and excretory system.

Generally, the colon, the stomach, and the intestines are the organs that are most compromised by these pathogens.

  • In fact, this group of dangerous bacteria is responsible for infantile gastroenteritis, salmonella, typhoid fever, and dysentery.
  • In the past, these diseases took a high number of lives during the time of plagues.
  • Besides, many of these dangerous bacteria have a great resistance to penicillin.

4. Enterococus faecium

intestines in skeleton

This bacteria coexists in the human intestines, but also can turn into a damaging agent.

Enterococcus faecium is responsible for neonatal meningitis. This is an infection that causes headaches, a stiff neck, fever, and photophobia, a condition that causes pain in bright light.

  • Currently, it has a high priority.
  • Additionally, it presents a problem that is resistant to antibiotics.
  • Most of the time, it is transmitted through a virus.

5. Staphylococcus aureus

There are bacteria that can link to a group of infections and diseases in various organs of the human body.

This is the case with staphylococcus aureus. As a result, it is capable of causing problems in the skin and the respiratory and digestive systems. 

Consequently, this microorganism can cause these conditions, among others:

  • Conjunctivitis
  • Cellulitis
  • Sepsis
  • Meningitis
  • Pneumonia

In addition, the great majority of these infections occur in hospitals.

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6. Helicobacter pylori

swollen intestine

This is a bacteria that attacks the stomach exclusively.  In general, it infects the gastric mucous and generates bloating.

It can cause:

  • Gastritis
  • Septic ulcer
  • Irritated colon
  • Lymphoma

In some cases, people contract this bacteria and have no symptoms throughout life. Saliva, feces and dental plaque transmit this bacteria.

7.  Campylobacter

In this case, we’re talking about the major carrier of food poisoning in the world.

These are the common symptoms that we find:

  • Vomiting
  • Fever
  • Diarrhea
  • Abdominal pain

Additionally, it can cause arthritis and Guillain-Barré Disease.

This is an bacterial agent this can be perfectly eliminated with conventional antibiotics. However, it’s also true that it is one of the most common and most dangerous bacteria.

Especially important is that ingesting food or water that is contaminated, a virus, or contact with an infected animal can transmit campylobacter.

8. Salmonella

glass of infected milk

Salmonella is a form of Enterobacteriaceae.

  • The incubation period is from one week to almost one month.
  • Symptoms go from a fever to vomiting, diarrhea and stomach upset.

After incubation, the symptoms could last up to 2 months in the worst cases.

Salmonella can survive for long periods of time in foods such as butter, milk, and chocolate.

9. Neisseria gonorrhaeae

Some dangerous infections are contagious by means of sexual contact. That is the case with this bacteria.

  • As its name indicates, this microbe can cause gonorrhea.
  • However, simple antibiotics such as ampicillin or penicillin can arrest this disease if detected in time.

















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  • Hyde, E. R., Haarmann, D. P., Lynne, A. M., Bucheli, S. R., & Petrosino, J. F. (2013). The living dead: bacterial community structure of a cadaver at the onset and end of the bloat stage of decomposition. PloS One.