what are the four ways by which communicable diseases spread?
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Infectious diseases can spread in a variety of ways: through the air, from direct or indirect contact with another person, soiled objects, skin or mucous membrane, saliva, urine, blood and body secretions, through sexual contact, and through contaminated food and water.
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Communicable diseases can be spread by
(i) physical contact
(ii) sexual intercross
(iii) oral transmission
(iv) droplets
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