The blood transfusion can cause sometimes problem to the patient in case when the mismatched blood is given in the patient's body. Sometimes the patient body is unable to uptake the foreign blood.
As the information in the question, the RN must stop the infusion. Urticaria represents the allergy in the blood plasma protein or the immune cell reaction in the body. The infusion is prevented as this might cause the destruction of immune cells in the body.
Plasmodesmata are microscopic channels which traverse the cell walls of plant cells and some algal cells, enabling transport and communication between them. This is the path that viruses use to spread throughout a plant's system.
