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Im pretty sure so is strept pneumoniae
COPD is also exacerbated by Viral infection: Rhinovirus, influenza, parainfluenza; and Bacterial infection: Haemophilus influenzae, Moraxella catarrhalis, Streptococcus.
however, the questions gives a hint that it may be legionella = "weekend retreat" which may be associated with this infection
From FA 2017 pg 139: Legionnaires’ disease—severe pneumonia (often unilateral and lobar A ), fever, GI and CNS symptoms. Common in smokers and in **chronic lung disease.**
I also believe that the other attendees showed signs of pontiac fever, which is another hint they tried to get at.
i did it wrong and chose influenza virus since it is most common infection in COPD but the clue in the Question is that the other attendee didnt get sick since in legionella there is no person to person transmission
but in Uworld s. pneumo is one of the most common bacterial exacerbation of COPD legionella wasn't even mentioned. How do we rule out s. pneumo ?
maybe because in children s.pneumo causes otitis media?
Another hint made in the Q stem is the location being rural Pennsylvania.... Legionnaires disease was first discovered by the outbreak in 1976 at a convention held in Philadelphia, Pennsylvania. Not sure why I know this fact...
Biggest hint towards legionella to me was that they all were at a residence hall... i.e. where there'd be air conditioners and such.