Why do I sometimes shiver from receiving thrombocytes?
So first of all, how do we prepare a unit of blood?
We take a unit from the blood donor and save it. Within the donor blood, as you recall, there are all the types of blood cells: white, red, and platelets.
In the blood bank, the blood cells are separated; red blood cells are taken and stored in a special bag (packed cells), but in each of the bags a few white cells also sneak in, these fight infections.
These cells can also pour substances into the blood that increase temperature or cause shivering (as has probably happened to you when you had the flu). If while giving you platelets, white blood cells or other spilled materials "snuck through", they could make you shiver.