Answer
It is an immune reaction that can cause fever, rash, swollen lymph glands and painful joints. It needs prompt clinical assessment.
Sources for this answer
- Atgam 50 mg/ml concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.