12th January 2024

A 42-year-old male presents to A&E with a 2-day history of confusion.

A 42-year-old male presents to A&E with a 2-day history of confusion. His wife reports that he recently returned from a stag party where he stayed in a hotel in Spain. Following his return 9 days ago, he has been complaining of a headache, diarrhoea and feeling generally unwell, as well as a dry cough. A chest X-ray is performed which shows right middle and lower zone patchy consolidation. Blood tests are taken, which show the following: 

Hb 135 g/L (130-180)

WCC 10.0 x 10*9/L (4.0-11.0)

Sodium 118 mmol/L (135-145)

Alanine aminotransferase (ALT) 98 U/L (<41)

CRP 60 mg/L (<10)

What is the most likely causative organism?

Select the SINGLE most appropriate option from the list below. Select ONE option only.