3. Which of the following are components in the chain of infection?
A. Direct contact, indirect contact, airborne, oral route, and insects and pests
B. Infectious agent, reservoir, portal of exit from the reservoir, mode of transmission, and portal of entry into the susceptible host
C. Aerobic, anaerobic, saprophytes, prions, and protists
D. Endogenous, exogenous, cell invasion, and allergic reaction
E. None of the above
Answer: B
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Fill in the blank(s) with the appropriate word(s).
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A. binds with water to form bicarbonate. B. is a strong acid and destroys only hydrogen ions. C. fully dissociates and maintains a high level of alkalinity. D. is a weak acid and can accept or donate hydrogen ions.