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The presence of wheezing and dyspnea, coupled with recent diagnosis and treatment for hemorrhagic tonsillitis, suggests a possible respiratory complication. The findings of right lower lobe infiltrates on chest X-ray indicate a pathological process affecting the lung. Between the options provided, Streptococcus pneumoniae is a common organism responsible for community-acquired pneumonia, especially in adults who may have pre-existing respiratory conditions or those who have had recent upper respiratory infections.

In older adults or those with underlying health conditions, Streptococcus pneumoniae can follow complications from infections such as tonsillitis, leading to pneumonia characterized by lobar infiltrates on imaging. The presentation of acute respiratory distress symptoms (wheezing and dyspnea) alongside these X-ray findings aligns with pneumonia due to this organism.

Furthermore, Streptococcus pneumoniae typically presents with lobar pneumonia, evident on imaging as infiltrates localized to a specific lobe, which corresponds with the right lower lobe infiltrates observed in the X-ray findings. This makes it the most appropriate diagnosis in this clinical scenario.