Forms of infection

2021-08-24 11:20 PM

For bacteria, the human body is a suitable habitat for many microorganisms, this environment has the right temperature, humidity, and food for them to grow. 

forms of infection, diagnosisbook

 

General perception

For bacteria, the human body is a suitable habitat for many microorganisms, this environment has the right temperature, humidity, and food for them to grow. Many bacteria reside (colonization) on the surface of the human body without harming the host organism, they live in normal commensal with the host body and form a normal microflora component. ) of the body, however, these bacteria will become pathogens when they cross the body's barriers (skin, mucous membranes) to enter the host's body. Virulent bacteria such as diphtheria, typhoid, cholera, dysentery bacteria .. always have a mechanism that makes it easy for them to grow in the host body and cause damage to organs or organs of the body. and cause infection.

When pathogenic microorganisms enter the host's body, under certain natural and social conditions, they cause a complex, interactive process called infection. In this process microorganisms are the cause, the human body is the object of perception. The objective circumstances directly or indirectly influence the infection. When microorganisms have not yet entered the body, environmental factors have a direct effect on humans and pathogenic microorganisms create favorable or unfavorable conditions for the infection process. When microorganisms have entered the body, the environment affects only humans and affects microorganisms.

Forms of infection

The infectious process leads to damage to the host's tissues or organs, disrupts the nervous and immune regulatory mechanisms, and causes obvious symptoms of the disease. These are clinical infections. The severity of symptoms depends on the organ affected and the extent of organ damage due to the infection.

In normal healthy people, most infections cause only negligible tissue damage and clinically there are no obvious manifestations of the disease that is latent infection. Asymptomatic infection renders the host immune to the infectious agent, enabling the body to effectively eliminate subsequent infection by that microorganism. 

In terms of epidemiological means, latent infections are very dangerous because they are an unknown source of pathogens in epidemics such as cholera, polio, and hepatitis. with clinical form.

The course of infection usually goes through four stages: incubation, onset, progression, and recovery. For most infections after recovery, the body is immune for a long time depending on the disease.

Infections can be local or systemic, acute or chronic.

When pathogenic microorganisms are directly transmitted from one person to another, causing new infectious processes, they give rise to infectious diseases. Infectious diseases can spread or develop into endemic or pandemics.

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