A 26-year-old male presents with a history of fever and a rash. He has
recently returned from a trip to Thailand. This has been his 3rd
trip there over the last 2 years.
On examination the patient has a widespread petechiae, his blood pressure is
Hb 19.0g /dL
Platelets 45 x 109/L
In this patient which of the following would you administer immediately?