understanding infectious diseases

powerpoint presentation section 21.1 understanding infectious diseases objectives identify the causes of infectious diseases. describe four ways in which infectious diseases are spread. section 21.1 understanding infectious diseases section 21.1 understanding infectious diseases myth there isn’t much a person can do to avoid spreading or catching a cold or the flu. fact about 80% of infectious diseases are spread by hand contact. washing your hands with soap and water is a simple and effective way to prevent the spread of colds and the flu. do you think most teens wash their hands as much as they should? what do you think are some ways to encourage more frequent hand washing? section 21.1 understanding infectious diseases also known as communicable diseases, …

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