harmful effects of micro organism

Bacteria: salmonella, tetanus, typhoid, cholera, gangrene, bacterial dysentery, diphtheria, tuberculosis, bubonic plague, meningococcal meningitis, pneumococcal pneumonia

Viruses: rabies, influenza (flu), measles, mumps, polio, rubella (german measles), chicken pox, colds, warts, cold sores

Protoctists: malaria, amoebic dysentery

Fungi: athlete's foot, ringworm

These disease-causing organisms are called pathogens and we often refer to them in everyday, non-scientific terms as ‘germs’ or bugs. Each disease has a specific pathogen, i.e. different diseases are caused by different kinds of germ. If the disease organism can be transmitted from one person to another it is said to be infectious. Non-infectious diseases, such as allergies, cancer, vitamin deficiency, and mental illness may develop when the body is not functioning properly.

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Microorganisms that cause illnesses also affect water quality. Bacteria are single-celled organisms that cannot be seen with the human eye except through a microscope. Some kinds of bacteria are the most dangerous microorganisms. They usually get into water supplies when untreated sewage mixes with the water supply.
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Microbes and disease this is answer
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