B. The patient will immediately spike a fever, followed by fits of chills and sweats.
Explanation:
The sentences follow a structure that start with a time period and follow with a happening. This is the case here in option B. The time period is when "<em>the patient will immediately spike a fever"</em>. What happens is that it will be <em>"followed by fits of chills and sweats"</em>. Also, this is the only option that is divided in two by a comma, which happens in all sentences os the excerpt.
