Which of the following infectious organisms would likely account for patchy peripheral densities with rapid progression to involve the entire lobe, as well as pleural effusion within an industrial worker specializing in humidifier maintenance?

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The patchy peripheral densities with rapid progression to involve the entire lobe and pleural effusion are consistent with Legionella pneumophila, which can cause a severe form of pneumonia known as Legionnaires' disease. This organism is commonly associated with water systems, such as cooling towers and humidifiers, making it a likely pathogen for an industrial worker specializing in humidifier maintenance. Pseudomonas aeruginosa and Klebsiella pneumoniae can also cause pneumonia, but they typically do not present with patchy densities and rapid progression. Mycoplasma pneumoniae may cause pneumonia, but it typically does not cause pleural effusion.

Which of the Following Infectious Organisms Would Likely Account for Patchy