Please help! what happens if someone was given the wrong blood from a transfusion?

Varies: Worst case of incompatible blood is major txfsn reaction w/fever back pain red urine jaundice shock and kidney failure. Minor incompatibility can cause delayed reaction with drop in blood count about 7 days later w/o other symptoms. Fever only reactions are common and harmless. Allergic reactions with hives, sometimes low BP can occur. Only the major reaction is checked for and shouldn't happen