Which of the following is NOT a true statement about microbial infections and disease?   1. Some infections are caused by normal microbiota acting as opportunistic pathogens 2. For some infections, a portion of infected people may never develop any signs or symptoms of disease  3. The time between the effective exposure and appearance of the very first signs or symptoms is called the incubation period 4. None of the other four answers (All are true statements) 5. All infectious diseases are communicable; i.e., they can be transmitted between hosts

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