Bacteria are large collections of miniscule unicellular living organisms less than 1 percent of which are harmful to health. These harmful bacteria divide and reproduce rapidly to cause infection and disease. Some even release toxins that injure body tissue. And yet some bacteria are beneficial to health.
Surprisingly, bacterial cells outnumber human cells in the body by a ratio of 10:1. Bacteria are concentrated largely in the gastrointestinal tract and on the skin. The human immune system is able to handle most bacteria. The most common types of bacterial infection are in the respiratory tract and account for over 2 million deaths per annum.Four Stages Of Bacterial Infection:
Different bacteria worked in different ways. But the reaction of all bacteria is to become intimate with the human cells in the body. The start of the disease is when the bacterial organisms become aggressive. The organisms secrete damaging toxins into the body where they begin to grow. In other cases bacteria attach themselves to the cells and send out a signal that triggers a marked alteration in the shape and behavior of cell. For instance common intestinal bacteria like Escherichia coli which causes diarrhoea encourages the host cell to shed its filaments called microvilli. The next step is to coax the cell to provide a location for the E. coli from where it can attack the natural defenses of the cell. The final stage is when pathogens not only come in contact with human cells by pierce and enter them. They trick the cell into allowing them access, the bacterial equivalent to a Trojan horse.
Bacterial infection is generally treated with antibiotics. These are of two types of antibiotics -- bacteriocidal and bacteriostatic. The former kills bacteria while the latter simply inhibits the growth.
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