Spock, parted from me and never parted, never and always, touching and touched.

Spock woke in a cold sweat from a haunting nightmare. He had seen what he dreaded most, his koon-ut-kal-if-fee, after which he won and gave up T'Pring, a woman he barely knew anyway, because she desired another man, Stonn. He saw his 'dead' captain. Spock's dream ended.
Pon farr? No, too early. Just a bad dream, probably merely his human side, which had given him more dreams than any normal full-Vulcan would ever have, throughout his life. He cranked down his metabolism to sleeping level and sat back down on his bed. He soon fell asleep.

Spock woke up to a call from the bridge.
"Mr. Spock to the bridge."
"Spock here, on my way."
Spock still didn't feel quite normal. He checked on every bodily function and found that his heart was racing and antibodies were being sent out. He doubled over in pain as he felt like something had punched him or maybe stabbed him in the stomach. He staggered back to the comm link. He pressed the button, still grimacing.
"Spock to sickbay," he rasped.
"Spock you sound terrible! Get up here."
Spock leaned against the wall for support. He tried to pull the antibodies back, to stop them from attacking where he had felt the pain. It didn't lessen, so he sent more antibodies after the source of the pain, to kill the microbes that were invading his body.
"On my w..."
Spock collapsed as the microbe, whatever it was, spread too quickly for him to manage, invading his brain.
McCoy rushed down to deck five, where he was certain Spock would be located. He was correct. He used a medical tricorder, trying to determine what was so wrong. He noticed an increase in blood temperature, spikes in hormone levels, and closed his tricorder.
"Pon farr? Is that it?"
He chuckled until he saw Spock begin to breathe heavily and shiver.
"That's no pon farr. It's an infection. With what?"
"Kirk to Spock, where are you?"
"McCoy here, Jim. Spock's unconscious."
"What happened?"
"I don't know just let me get him to sickbay."
"Acknowledged, Kirk out."
"Sulu, you have the conn."
In the mean time, McCoy got Spock to sickbay and put him on a diagnostic bed. He analyzed the readings and decided to give Spock a tranquilizing agent.
Nurse Chapel got a blanket for Spock and spent several minutes tucking him in and adjusting the blanket.
Doctor McCoy just rolled his eyes. Her infatuation with Spock was a little annoying sometimes. He drew some blood for analysis and sent it to the medical lab to be analyzed by some medical technicians whom he pitied for being so bored all the time. They spent quite a while trying to determine what the parasite was and how to treat it, performing many tests, and analyzing and submitting the results, analysis attached, to McCoy.