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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