Which term describes non-pathogenic microbes that can cause disease in a host with a compromised immune system?

• A. Saprophytes
• B. Opportunistic pathogens
• C. Obligate pathogens
• D. Commensals

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definitions of each term provided in the options. Saprophytes are microbes that feed on dead or decaying organic matter and are generally non-pathogenic.
2. Step 2: Recognize that obligate pathogens are microbes that always cause disease when present in a host, regardless of the host's immune status.
3. Step 3: Commensals are microbes that live on or within a host without causing harm or benefit under normal conditions.
4. Step 4: Identify that opportunistic pathogens are normally non-pathogenic microbes that can cause disease when the host's immune system is weakened or compromised.
5. Step 5: Conclude that the term describing non-pathogenic microbes causing disease in immunocompromised hosts is 'opportunistic pathogens' based on the definitions and context.