Pneumonia, radiographically presenting as extensive, bilateral, ill-defined opacities in the lower lobes with pleural effusion, in a HIV patient on a ventilator is likely resultant from which of the following infectious organisms?

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Pseudomonas aeruginosa is an opportunistic pathogen commonly associated with pneumonia in immunocompromised individuals such as those with HIV, and is known to cause extensive, bilateral, and poorly defined infiltrates on chest radiographs. The presence of pleural effusion also suggests a bacterial etiology. Haemophilus influenzae and Actinomyces israelii are not commonly associated with pneumonia in immunocompromised individuals. Mycobacterium tuberculosis typically presents with more upper lobe involvement and usually has a more slow and indolent course of progression.

Pneumonia, Radiographically Presenting as Extensive, Bilateral, Ill-Defined Opacities in the Lower