Site of Infection (Nidus)

A site of infection (nidus) is a place in the body where microorganisms multiply and accumulate. This may be an area of ​​tissue, cavity or organ that provides optimal conditions for the growth and development of bacteria.

The source of infection is characterized by the presence of the following factors:

  1. Accumulation of pathogenic microorganisms in large quantities
  2. Favorable conditions for their reproduction (sufficient nutrition, optimal temperature, humidity)
  3. Weakened immunity and reduced tissue resistance in this area
  4. Lack or insufficiency of blood supply and lymphatic drainage, which impedes the delivery of immune cells and antibodies

Typical sites of infection are chronic wounds, abscesses, necrotic tissue, foreign bodies, etc. Often, the focus of infection is formed against the background of an inflammatory, dystrophic or degenerative process. It can persist for a long time, maintaining the chronic course of the disease and being a source of exacerbations and complications.

Thus, the focus of infection is the optimal environment for the reproduction and accumulation of pathogens, which supports the pathological process and threatens the development of a generalized infection. Identification and sanitation of foci of infection is an important task in the complex treatment of many diseases.



The focus of infection (lat. Nidus) is the place of introduction and reproduction of microorganisms, which provides the most optimal conditions for their growth and development. It can be presented either as a single organism or as a group of organisms that are in close contact with each other.

Foci of infection can be caused by various microorganisms, such as bacteria, viruses, fungi and parasites. They can be present in the environment, for example, in soil, water, air or on the surface of various objects.

One of the most common sources of infection is the human body. Microorganisms such as bacteria and viruses can enter the body through the skin, mucous membranes of the respiratory tract, gastrointestinal tract or wounds. After entering the body, microorganisms begin to multiply and release toxins that can cause various diseases, such as influenza, pneumonia, tuberculosis, meningitis, hepatitis and others.

Another example of a source of infection is soil. Soil may contain various microorganisms that can cause diseases in humans and animals. For example, soil may contain bacteria that cause intestinal infections such as salmonellosis.

To prevent the spread of outbreaks of infections, it is necessary to follow the rules of hygiene and disease prevention. This includes washing your hands regularly, avoiding contact with people who are sick, using personal protective equipment such as masks and gloves, and disinfecting surfaces that may be contaminated.

It is also important to monitor the quality of drinking water and food to prevent microorganisms from entering the body. In addition, it is necessary to vaccinate against certain diseases that can spread through outbreaks of infection.

In conclusion, it can be said that foci of infection are an important factor that can lead to the spread of various diseases. Therefore, it is important to take measures to prevent and control outbreaks of infection to reduce the risk of infection and spread of disease.



The source of infection (nidus) is the place where bacteria are introduced and spread, where optimal conditions are created for their reproduction. In this place, bacteria receive all the necessary nutrients and conditions for rapid growth and development.

Foci of infection can be of different sizes - from small to huge, and located in different parts of the body. For example, foci of infection often occur in the respiratory tract, on the skin and mucous membranes, and in the intestines.

For a source of infection to occur, certain conditions are necessary. First, bacteria must enter the body through damaged tissue or mucous membranes. Secondly, they must be able to reproduce in favorable conditions.

One of the most common foci of infection is a purulent abscess. It occurs when bacteria enter the skin or subcutaneous tissue. Bacteria begin to actively multiply and form pus, which is the main sign of an abscess.

Another example of a source of infection would be pneumonia. It occurs when the lungs become infected with bacteria that enter through the respiratory tract. As a result, pneumonia begins, which is accompanied by cough, fever and other symptoms.

Overall, infection is a complex process that requires careful study and understanding. However, knowing the basic principles of the occurrence of foci of infections and their symptoms, you can take timely measures to prevent the development of the disease and treat an existing infection.