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62013 Microbiology

An 11-day-old neonate has been brought to his paediatrician because the infant has developed a sharp cough. Physical examination also reveals a mild conjunctivitis with some pus; a chest film confirms pneumonia. No organisms are seen on Gram stain of the pus. What is the most likely causative agent?

AAn obligate intracellular organism unable to make its own ATP
BA diplococcus that has a high potential to cause blindness as well as the pneumonia
CAn organism that has no peptidoglycan or other cell-wall polymer
DAn obligate intracellular organism infective vascular endothelium
Microbiology
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