How Bacterial Infections Are Transmitted

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How Bacterial Infections Are Transmitted
How Bacterial Infections Are Transmitted

Video: How Bacterial Infections Are Transmitted

Video: Bacterial Infections in Humans 2022, December

Once in the human body, bacteria take root in it, finding all the necessary conditions for existence and reproduction. However, they are easily transmitted to other people in a variety of ways.


Step 1

Many infections are transmitted by airborne droplets, and among them there are a large number of bacterial ones: scarlet fever, diphtheria of the pharynx and respiratory tract, whooping cough and meningococcal infection. In order to catch one of the above infections, it is enough just to be at a short distance from the patient or carrier. Moreover, infection can occur during a conversation with a patient or at those moments when he cries, coughs and sneezes. Bacteria can also be in the air for a long time, and due to the presence of an electric charge in it, they can move long distances and penetrate into neighboring rooms.

Step 2

Along with airborne droplets, the dust method of transmission of bacterial infections is quite common. While some bacteria cannot exist for a long time outside a living organism, being suspended in the air, others quickly find a "refuge" in layers of dust on furniture, walls, etc. This route of transmission is characteristic of scarlet fever, diphtheria, tuberculosis, salmonellosis.

Step 3

Contact-household is the method of transmission of infection in which everyday objects are involved: books, dishes, telephones, etc. They act as temporary carriers of infectious agents, so a person who uses a mug from which the patient previously drank can instantly become infected. In this way, dysentery, scarlet fever, tuberculosis, helminthiasis and diphtheria are transmitted. Most often, children are infected by putting their hands in their mouths after touching various objects with them. And the pathogens of the well-known tetanus hide in layers of contaminated soil.

Step 4

In the alimentary (fecal-oral) method, contaminated water, milk and meat of sick animals are directly involved. Water in shallow lakes and bodies of water is often contaminated through wastewater, which carries the excreta of sick people and animals, and with it pathogens such as cholera, typhoid fever and bacterial dysentery. The meat of sick animals, which has not been subjected to sufficient heat treatment, is no less dangerous than contaminated water. Its use leads to infection with E. coli, dysentery, yersiniosis, scarlet fever.

Step 5

There is also a transplacental transmission of bacterial infections. The name speaks for itself: this method is typical for cases when the infection is transmitted from an infected woman to her fetus through the placenta. Transplacental transmission is typical for leptospirosis, syphilis, tuberculosis, streptococcal and staphylococcal infections. Infection of the fetus through the mother's placenta often turns into disastrous consequences: intrauterine death or the birth of a child with serious abnormalities.

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