QuestionSBA
QuestionChoice
This is incorrect. Klebsiella pneumonia is most commonly seen in patients with alcohol dependence. A classic sign is red-currant jelly sputum. As the patient in this case only has around 3 units of alcohol per week, Streptococcus pneumoniae is a more likely causative organism.
10025901
b
Klebsiella pneumoniae
QuestionChoice
This is incorrect. Haemophilus influenzae is the second most common cause of pneumonia, and is often associated with bronchiectasis exacerbations. It is not as common as Streptococcus pneumoniae, making this option incorrect.
10025902
c
Haemophilus influenzae
QuestionChoice
This is incorrect. Pneumocystis jirovecii typically only causes pneumonia in patients who are immunocompromised or HIV positive (particularly if CD4 count is below 200cells/uL). As this patient has no past medical history, Pneumocystis jirovecii is an unlikely causative organism.
10025904
e
Pneumocystis jirovecii
QuestionChoice
This is incorrect. Legionella pneumonia is associated with Legionnaire's disease. It is classically seen in a patient recently exposed to poor hotel air conditioning. Blood tests may show hyponatraemia and deranged liver function tests. It is not as common as Streptococcus pneumoniae, making this option incorrect.
10025903
d
Legionella pneumophila
QuestionChoice
This is correct. The patient has classic signs and symptoms of a lower respiratory tract infection, or pneumonia. Their symptoms (shortness of breath and cough), examination findings and imaging results are all consistent with this diagnosis. The most common causative microorganism is streptococcus pneumoniae.
10025900
a
Streptococcus pneumoniae
Concept
Chapter
2693
3709
Pneumonia
Topic
132
Respiratory
17578
A 65 year old male presents to A&E feeling generally unwell. For the past 2 days, he has had a cough productive of purulent sputum and becomes breathless walking only short distances. He has no regular medications and no past medical history. He consumes one glass of wine on a Saturday and has never smoked cigarettes.

On examination, there is dullness to percussion over the left lower lobe, as well as increased vocal resonance. A chest x-ray shows consolidation in the left lower lobe.

Which of the following is the most likely causative microorganism?
a