Pneumonia is the sixth leading cause of death, and the number 1 cause of death from infectious disease, in the United StatesThe image below depicts typical bacterial pneumonia.
Image in a 49-year-old woman with pneumococcal pneumonia. The chest radiograph reveals a left lower lobe opacity with pleural effusion.
Pathogens like Haemophilus influenzae, Staphylococcus aureus, and gram-negative enteric bacteria cause clinical syndromes similar to that due to Streptococcus pneumoniae. However, other pathogens cause an atypical pneumonia syndrome, and this was initially attributed to Mycoplasma pneumoniae.
Other pathogens, including bacteria and viruses are now known to cause similar syndromes indistinguishable from that due to M pneumonia. Therefore, the term atypical pneumonia represents diverse etiologic entities and may have limited clinical value.
Image in a 49-year-old woman with pneumococcal pneumonia. The chest radiograph reveals a left lower lobe opacity with pleural effusion. Typical versus atypical syndromes
The classification of pneumonias as either typical or atypical arose from the observation that the presentation and natural history of some patients with pneumonia were different compared with those with pneumococcal infection.Pathogens like Haemophilus influenzae, Staphylococcus aureus, and gram-negative enteric bacteria cause clinical syndromes similar to that due to Streptococcus pneumoniae. However, other pathogens cause an atypical pneumonia syndrome, and this was initially attributed to Mycoplasma pneumoniae.
Other pathogens, including bacteria and viruses are now known to cause similar syndromes indistinguishable from that due to M pneumonia. Therefore, the term atypical pneumonia represents diverse etiologic entities and may have limited clinical value.
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