Multiple choice

A male patient came with symptoms of urethritis. The examination revealed only pus cells but no organisms. Lesions are caused by

  1. chlamydia trachomatis

  2. haemophilus ducreyi

  3. treponema pallidum

  4. none of these
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A Correct answer
Explanation

Chlamydia trachomatis causes non-gonococcal urethritis (NGU). As an obligate intracellular organism with no cell wall, it's not visible on routine Gram stain despite causing inflammation (pus cells).

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