Chlamydia can prevent the formation of phagolysosomes and therefore can
a. avoid being phagocytized.
b. avoid destruction by complement.
c. prevent adherence.
d. avoid being digested.
e. none of the above

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Understand the role of phagolysosomes in the immune response: Phagolysosomes are formed when a phagosome fuses with a lysosome inside a phagocytic cell, leading to the digestion and destruction of the engulfed microorganism.

Recognize that if Chlamydia can prevent the formation of phagolysosomes, it means it can interfere with the fusion process, thereby avoiding the environment where it would be digested by lysosomal enzymes.

Analyze each option in the context of this mechanism: (a) Avoid being phagocytized refers to preventing engulfment, which is different from preventing digestion after engulfment; (b) Avoid destruction by complement involves a different immune pathway unrelated to phagolysosome formation; (c) Prevent adherence relates to the initial attachment to host cells, not phagolysosome formation; (d) Avoid being digested directly relates to preventing phagolysosome formation and subsequent degradation.

Conclude that the correct understanding is that by preventing phagolysosome formation, Chlamydia avoids being digested inside the phagocytic cell.

Therefore, the best answer corresponds to the option that reflects avoidance of digestion after phagocytosis.

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