Final answer:
Transfusion-transmitted toxoplasmosis is associated with packed red blood cells. This underlines the importance of careful screening and selection of blood to prevent transmission of infections in transfusion recipients who may be immunocompromised.
Step-by-step explanation:
Transfusion-transmitted toxoplasmosis is associated with packed red blood cells (A). Toxoplasmosis is a protozoal infection that can be serious in immunocompromised individuals or in developing fetuses. It's important, therefore, to ensure blood safety for transfusion recipients, as they could be at risk if they receive contaminated blood products.
The antibody screening test done with pretransfusion blood typing helps to ensure that recipients are not making antibodies against antigens outside of the ABO or Rh systems. In this context, safe blood transfusions are essential as getting a transfusion with an incompatible ABO blood type can lead to a potentially lethal hemolytic transfusion reaction. Hence, careful screening and selection of blood products, such as packed red blood cells, are critical to prevent transmission of infections such as toxoplasmosis.