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Infectious Diseases Illnesses

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Infectious Diseases
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Reading Level

	edHelper's suggested reading level:	grades 4 to 6
	Flesch-Kincaid grade level:	8.06

Vocabulary

	challenging words:		antiviral, infectious, pathogen, protozoans, tetracycline, disease, production, individually, sinus, tuberculosis, parasitic, identify, typhoid, penicillin, chickenpox, ringworm
	content words:		United States

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Infectious Diseases By Jennifer Kenny

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¹     What is an infectious disease? It is any disease caused by pathogens, or agents that cause disease, that have invaded the body. Bacteria, viruses, fungi, and parasites are some pathogens. Maybe the pathogen was passed from person to person. It could come from food. It might come from an animal. It could come from something around you.
 
²     Some bacteria cause disease. Many of them, though, are harmless and are actually helpful like the ones in your mouth or intestines. The bacteria that are harmful, however, can cause tuberculosis, tetanus, and sinus infections. Bacteria can't be seen without a microscope, and they are single-celled.
 
³     Viruses can also cause disease. They don't live freely on their own. Instead, they take control of cells in your body and have them make more copies of the virus. Those viruses attack other cells and have them make more copies of the virus, too. The cold, the flu, chickenpox, and measles are all caused by viruses.

Paragraphs 4 to 9:
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Illnesses

Illnesses

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