I don’t know. With respect to Moderna’s vaccine, when I saw Phase I trial results in the Lancet (link no longer available) it said the following:
“Nine participants (two [6%] in the low dose group, two [6%] in the middle dose group, and five [14%] in the high dose group) had an episode of severe fever (grade 3) with axillary temperature GREATER than 38·5°C.”
In the supplementary results, it summarized that the grade 3 fever occurred on the same day or 1 day after vaccination and lasted 24-48h. 2 people from high dose group took antipyretic medicine and others did not take medicine.
Another section of the paper stated:
“Between 42% and 56% of the participants reported a fever. Between 6 and 17% reported a Grade 3 fever.”
Google grade 3 fever… it’s high… higher than 104 F for less than 24 hours.
Hopefully the side-effects were reduced in subsequent trials!