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The body is continually exposed to many species of bacteria, including beneficial commensals, which grow on the skin and mucous membranes, and saprophytes, which grow mainly in the soil and in decaying matter. The blood and tissue fluids contain nutrients sufficient to sustain the growth of many bacteria.
Pathogenic bacteria are bacteria that can cause disease. [1] This article focuses on the bacteria that are pathogenic to humans. Most species of bacteria are harmless and many are beneficial but others can cause infectious diseases. The number of these pathogenic species in humans is estimated to be fewer than a hundred. [2]
As microorganisms, in particular bacteria, are found virtually everywhere, harmful microorganisms may be reduced to acceptable levels rather than actually eliminated. In food preparation, microorganisms are reduced by preservation methods such as cooking, cleanliness of utensils, short storage periods, or by low temperatures.
Ultimately, we end up with trillions of microbes, including bacteria, fungi, parasites and viruses — all of which can be either helpful or harmful to our bodies.
Fluoride is beneficial, say experts. According to the Centers for Disease Control and Prevention (CDC), it's considered " one of 10 great public health achievements of the 20th century" thanks to ...
The healthy uterine microbiome has been identified and over 278 genera have been sequenced. Bacteria species like Fusobacterium are typically found in the uterus. [12] Although Lactobacillus may be beneficial in the vagina, “increased levels in the uterus through a breach in the cervical barrier” may be harmful to the uterus. [13]
Antibiotics can cause antibiotic-associated diarrhea by irritating the bowel directly, changing the levels of microbiota, or allowing pathogenic bacteria to grow. [7] Another harmful effect of antibiotics is the increase in numbers of antibiotic-resistant bacteria found after their use, which, when they invade the host, cause illnesses that are ...
The mechanism of distinguishing between harmless and harmful bacteria on the molecular as well as on physiological levels is not completely understood. Nonpathogenic organisms are those that do not cause disease, harm or death to another organism. The term is usually used to describe bacteria.