A disease that is caused by a virus or a bacterium is called infectious disease. Infectious diseases are spread by a direct contact with the infected organism, through water and air, on food, by contact with contaminated objects, and by disease carrying organisms called biological vectors ( such as birds, cats,dogs,fleas..)
- people can also be carriers of disease: when you have influenza and sneeze, you expel thousands of viruses into the air.
- cold and many other diseases are spread through contact.
P.S: - A virus is a minute piece of genetic material surrounded by a protein coating that infects and multiplies in hos cells. The host cells die when the viruses break out of them. These new viruses infect other cells, leading to the destruction of tissues or the interruption of vital body activities.
- to avoid the spread of disease and ill-health, take a better care of the body, keep water supplies clean, exercise and eat a healthy diet
What are three ways that pathogens are reduced in today's operating room????
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source of image : Personal Hygiene, Health, Grooming & Body Care Films (1928-1953) (www.qualityinformationpublishers.com/personal... )
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source of image : 1957 Gr 5 Health note How Communicable Diseases Spread (timetraces.com/.../
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