"Adverse" means harmful or unfavorable, and transfusion probably refers to blood transfusion--so a negative reaction to a blood transfusion? The term is very vague; without context it's hard to say exactly what this would mean.
it is a preventable adverse event.
The blood given by transfusion must be matched with the recipient's blood type. Incompatible blood types can cause a serious adverse reaction (transfusion reaction). Blood is introduced slowly by gravity flow directly into the veins
A bad trip.
Stinging
Edward Tabor has written: 'Infectious complications of blood transfusion' -- subject(s): Adverse effects, Blood, Blood Transfusion, Communicable diseases, Complications, Transfusion, Transmission 'Emerging Viruses in Human Populations, Volume 16 (Perspectives in Medical Virology) (Perspectives in Medical Virology)'
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An acute febrile reaction is the most common adverse reaction to a blood transfusion. This is typically treated with tylenol.
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Risks associated with autologous blood transfusion include transfusion reaction if an allogeneic blood transfusion was inadvertently given and transmission of infectious agents if the blood became contaminated.
Saying not adverse means you are not against. An adverse reaction 'goes against' the expected reaction. I am not adverse to reading my science textbook.
The doctor will recommend a blood transfusion in the event of severe hemorrhage to replace the blood and plasma lost. It is essential that an adequate blood volume is maintained.