Microorganisms are small organisms which are invisible to human eye. The study of microorganisms is called microbiology. Microorganisms benefits humans in several ways. Industrially microorganisms are useful for production of various beverages.With the help of microorganisms many antibiotics have been prepared which helped human kind to eliminate various diseases. The microorganisms were used as models to study various diseases and their consequences. Microorganisms include bacteria, fungi, viruses and some protozoans.
The human body contains normal flora. The normal flora benefits humans from certain environmental conditions. Almost every part of human body is occupied by normal flora. Some of the most important types of bacteria that are more beneficial than other types of bacteria include Candida, Staphylococcus epidermidis and Lactobacillus bulgaricus.

Candida is mostly found in human’s mouth, skin, vagina and stomach. This bacterium eliminates the growth of other harmful bacteria. Increase in accumulation of Candida in the respective areas leads to cause fungal infections. Staphylococcus epidermidis is mostly present on skin surface. This bacterium eliminates other bacteria that cause skin rashes and other skin infections.
Lactobacillus bulgaricus is present on Tongue, stomach and small intestine. This bacterium controls the growth of harmful bacteria. This bacterium helps in breaking the lactose in milk and thus helps people who are lactose intolerant. Stress, poor nutrition can reduce the growth of Lactobacillus bulgaricus.

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