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    Question ID:   2453         Current Version: 2
Question: What are microbes?
Category: Science > Biology
Keywords: microorganism, bacteria, viruses, fungi, microscopic organisms, protozoa, microbes
Type: what
Rating:(0 ratings)    Views: 726    Discussions: 0   In Watch Lists: 2  

 
    Answer:

Microbes are tiny organisms-too tiny to see without a microscope, yet they are abundant on Earth. They live everywhere-in air, soil, rock, and water. Some live happily in searing heat, while others thrive in freezing cold. Some microbes need oxygen to live, but others do not. These microscopic organisms are found in plants and animals as well as in the human body.

Some microbes cause disease in humans, plants, and animals. Others are essential for a healthy life, and we could not exist without them. Indeed, the relationship between microbes and humans is delicate and complex.

Most microbes belong to one of four major groups: bacteria, viruses, fungi, or protozoa. A common word for microbes that cause disease is "germs." Some people refer to disease-causing microbes as "bugs." "I've got the flu bug," for example, is a phrase you may hear during the wintertime to describe an influenza virus infection.

Since the 19th century, we have known microbes cause infectious diseases. Near the end of the 20th century, researchers began to learn that microbes also contribute to many chronic diseases and conditions. Mounting scientific evidence strongly links microbes to some forms of cancer, coronary artery disease, diabetes, multiple sclerosis, and chronic lung diseases.

MICROBES IN THE HEALTHY HUMAN BODY*

Microbes found in
Ear (outer) Aspergillus (fungus)
Skin Candida (fungus)
Small intestine Clostridium
Intestines Escherichia coli
Vagina Gardnerella vaginalis
Stomach Lactobacillus
Urethra Mycobacterium
Nose Staphylococcus aureus
Mouth Streptococcus salivarius
Large intestine Trichomonas hominis (protozoa)

*A selection of usually harmless microbes, some of which help keep our bodies functioning normally. If their numbers become unbalanced, however, these microbes may make us sick. All are bacteria, unless otherwise noted.
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