General information about infectious diseases in children

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Infectious or communicable diseases caused by pathogenic microorganisms. Their main feature is the ability to be transmitted from one person to another with a tendency to widespread among the population.
Pathogenic, or pathogenic organismsthat are pathogens of infectious diseases, are tiny creatures that are visible only under a microscope at very big increase.
The world of microbes that live on our planet, is very wide and diverse. Among the vast realm of these tiny organisms many useful to humans: they contribute to soil fertility, determine the processes of fermentation and rotting dead organisms (thus participating in the circulation of substances in nature), form antibiotics, with great effect used against many pathogens etc.
However, along with useful or harmless microorganisms exist pathogenic microbes - pathogens of infectious diseases of humans, animals and plants, in the body of which they are the only feasible or best for their life conditions.
The number of human pathogens microorganisms is very high. By its size, shape, biological properties, they are extremely diverse. These include bacteria in the form of balls (cocci), sticks of various sizes (bacteria, Bacillus), spirochaetes, having the form of a spiral or spin, vibrios, resembling a comma, a single-celled fungus, viruses, etc.
After the opening of the virus belongs to the talented Russian scientist D. I. Ivanovski. It was he who first raised the curtain on the unknown even before world smallest microorganisms, invisible even through the most powerful optical microscopes. Due to its insignificant size viruses can pass through a very fine laboratory filters, impervious to bacteria and other microorganisms. So they are also called filterable virus.
Viruses, their form, structure studied using electron microscope is a complex device, which magnifies the image does not light rays, and using beams of electrons; this can be obtained increase in the tens and hundreds of thousands of times.
Viruses show their livelihoods and reproduce only inside the cells of a multicellular organism, including the human body. As the bacteria that are useful or harmless viruses and viruses pathogenic for humans, animals and plants. A significant part of all infectious diseases of humans is of the nature of the virus.
It should be noted that various pathogens strictly specific; each one causes a disease, or, in other words, each infection has its specific pathogen.
Pathogenic microbes at his death, and some are in the process of life emit strong poisonous substances, or toxins. Toxins are the most important factor of pathogenic microbial activity.
The process of interaction between the pathogen and the human body is called infection. If this interaction causes a disturbance of physiological functions, manifested painful signs (symptoms), this is evidence of infectious disease. Along with this there is often so-called hosting (hosting, virusencyclo), where infection is not accompanied by any external expressions; in this asymptomatic infection person remains healthy.