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Harmful types of bacteria and ways to control and treat them


Harmful bacteria that infect humanity are those that cause infectious diseases in other organisms. There is very little pathogenic bacteria. The most common bacterial disease is tuberculosis, caused by the bacterium Mycobacterium tuberculosis, which has killed nearly 2 million people in one year, most of them in sub-Saharan Africa.

Harmful disease-causing bacteria contribute to other global diseases, such as pneumonia, which can be caused by bacteria such as streptococcus and pseudomonas, and food-related diseases, which can be caused by bacteria such as Shigella, Campylobacter, and Salmonella. Pathogenic bacteria also cause infections such as tetanus, typhoid fever, diphtheria, syphilis, gonorrhea and leprosy.

History of bacteria

Koch’s postulates, proposed by Robert Koch in the 1890s, are criteria designed to establish a causal relationship between a pathogenic microorganism and a disease. The cause of a known medical entity could only be discovered after many years, as in the case of the association between Helicobacter pylori and human stomach ulcers.

Harmful bacteria have different ways of causing disease. Schematically, we can say that harmful bacteria can cause disturbances in the organism: such as the introduction of poison into the body, or the excretion of various substances without being toxic in themselves, causing infection.

The causative power of bacterial disease boils down to:

Toxic force and virulence (is the management of reproduction in the organism). Caused by some pathogenic microbes by introducing a toxin into the host. It can be considered as the live beating force of the bacterium, since each pathogen has a distinct spectrum of interactions with its human hosts. Some harmful bacteria such as Staphylococcus can Or Streptococcus, to cause severe skin infections and pneumonia, meningitis, and sometimes sepsis, a systemic inflammatory response in which shock, massive vasodilation and death occur.

How do bacteria reproduce?

Bacteria reproduce by reproduction. Where an individual makes a copy of his DNA and then divides to produce two types of harmful bacteria. Generally, this copy is identical to the original strand of DNA, so every bacteria of the same strain is a clone of their siblings. But sometimes, when DNA is copied, an error occurs which results in a mutation in the sequence.

This mutation is the source of a new strain. In addition, bacteria can incorporate into their genetic sequence a piece of DNA from another microorganism. All of these changes in the DNA sequence could allow the bacteria to adapt to a new environment. In some cases, harmful human bacteria appear in the classic harmless species.

Some types of harmful bacteria are more dangerous to humans

The facts were validated by Francisco Maria Garcia, July 24, 2020 AD, however, there are some dangerous bacteria that can be very harmful to the body and cause various harms if they are not detected and treated in a timely manner. The World Health Organization (WHO) has published a list of the most dangerous bacteria to humans.

Among them, the bacteria that killed the largest number of victims. Knowing these microorganisms, the symptoms they cause, and the complications they can cause is important for maintaining a healthy and healthy environment. Given that most of these harmful bacteria cause disease, if left untreated, they put patients’ lives at risk. The list also indicates the need for medical laboratories to produce new antibiotic drugs to deal effectively with each threat. Among these types we mention:

One of the dangerous and deadly bacteria (Acinetobacter baumannii):

The attacks of this pathogen are very diverse, and therefore it is sometimes difficult to detect them. This sample of harmful and dangerous bacteria is associated with AIDS and cystic fibrosis patients. It can also cause minor skin inflammation due to ingestion of contaminated water. The risk of it is the ability to reproduce in HIV-infected organisms. It also causes severe pulmonary and inflammatory complications.

Intestinal bacteria:

Enterobacteriaceae is a family of disease-causing microorganisms that primarily affect the digestive system and excretion (that is, it affects the colon, stomach and intestines). This group of harmful and dangerous bacteria is responsible for infantile gastroenteritis, salmonella, typhoid fever and bacillary dysentery .

As it is a harmful bacteria, which claimed the lives of a large number of lives during the historical episode of the plague. Many of these dangerous bacteria also have significant penicillin resistance.

Enterococcus faecalis:

These bacteria can live in the human gut without harming them, but under certain conditions they can turn into harmful bacteria. The fecal enterococcus is responsible for neonatal meningitis, an infection that causes headache, neck stiffness, photophobia and fever. It is currently enjoying a high priority level because of the problem it poses, which is its resistance to some antibiotics.

Staphylococcus aureus:

Staphylococcus aureus

There are harmful bacteria that can cause a series of infections and diseases in various organs of the human body. This is the condition (Staphylococcus aureus) that is capable of causing skin , respiratory and digestive problems.

Among the diseases caused by this harmful bacteria:

  • Sepsis.
  • Cellular tissue.
  • Meningitis.
  • Pneumonia.
  • conjunctivitis.

Additionally, the vast majority of injuries that occur in hospitals are attributed to it.

Helicobacter pylori:


It is a harmful bacterium, and Helicobacter pylori lives exclusively in the stomach and generally infects the gastric mucosa, causing inflammation. In addition, it can cause the following diseases:

  • Gastritis.
  • Lymphoma.
  • Septic ulcer.
  • Irritation of the colon.

In some cases, people become infected with H.pylori without developing any symptoms throughout their lives. It is transmitted through saliva, feces and teeth.


Perhaps we are talking about the largest vector of food poisoning in the world. Among its common symptoms we find:

  • Fever.
  • Diarrhea.
  • Vomiting
  • Stomach ache.
  • In some special cases it can cause arthritis or Guillain-Barré syndrome.

This is a harmful bacterial agent that can be completely combated with conventional antibiotics, but it is also true that it is one of the most common and dangerous. It can be transmitted through ingestion of contaminated food or water, viruses, or contact with animals that carry it.

Salmonella, another dangerous bacteria:

Salmonella is a form of harmful intestinal bacteria that is known to cause salmonella infection. The incubation period ranges from about a week to a month. Symptoms it causes:

Fever, vomiting, diarrhea, and stomach upset, and once incubation the symptoms can last for up to two months, in the worst cases. It can survive for long periods in dairy products such as butter, milk, and chocolate.

Neisseria brown:

It is a harmful bacterium that spreads some types of dangerous infections through sexual contact. This microbe is the known cause of gonorrhea. Simple antibiotics such as ampicillin and penicillin can counteract the effects of this disease when caught early.

There are also two main types of pathogenic bacteria:

The first type:

It includes harmful bacteria only for people whose natural immunity is weakened. For example, certain strains of Escherichia coli cause intestinal disease in young children and the elderly, whose defenses are weaker than those of the rest of the population.

The second type:

It is bacteria that also harm healthy people. We can cite Yersinia pestis, the bacteria responsible for bubonic plague.

Treating harmful bacteria

Harmful bacterial infections can be treated with antibiotics, which are classified as bactericides if they kill harmful bacteria, or antibacterial if they only prevent bacterial growth. There are many types of antibiotics, and each class inhibits a different process in the pathogen than in the host. For example, the antibiotics chloramphenicol and tetracycline suppress the bacterial ribosome, but not the ribosome of structurally different eukaryotes, thus showing selective toxicity.

How can harmful bacteria be effectively combated?

It is essential to understand how harmful bacteria spread and their resilience. The diversity of these microorganisms within the species means knowing which strain is particularly responsible for the infectious disease.

The first step is to isolate the bacteria, that is, to extract them from their growth medium. To do this, researchers look for some bacterial environment (such as lung mucus in cystic fibrosis) and put it on a nutrient on which the bacteria grow. Once isolated, researchers study its DNA sequence by comparing it with those of known strains, in order to determine its genetic characteristics.

Then they create different disease profiles, based on multiple criteria: such as the severity of the strain, generations of patients, location of life … The purpose of this type of monitoring is to contain or even avoid the spread of infection.

In the end..

Check yourself periodically, as early detection and treatment of any disease, including those caused by harmful and more dangerous bacteria, is vital. Finally, remember that you should avoid self-medication, as it may cause complications. And if you want to take any medication, it is best to consult your family doctor.



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