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Answer:
2.There are three modes of transmission, namely: simplex, half duplex, and full duplex.
3.Some examples of the communicable disease include HIV, hepatitis A, B and C, measles, salmonella, and blood-borne illnesses.Most common forms of spread include fecal-oral, food, sexual intercourse, insect bites, contact with contaminated fomites, droplets, or skin contact.