Alicia Brown is a 24 year old student who has recently returned from travelling across East Africa volunteering in rural villages. Since returning to the UK five days ago, she has developed worsening diarrhoea, crampy abdominal pain and fevers. She has noticed some blood in her stool. She is usually fit and well and has taken appropriate malaria chemoprophylaxis.

Observations:

Temperature 37.5

Pulse 60

Blood Pressure 133/67

Respiratory rate 16

Oxygen saturations 99%

Examination:

No abdominal distension, mild tenderness to deep palpation, no masses, bowel sounds normal.
Cardiovascular, respiratory and neurological examinations are unremarkable

What is the next best course of action?