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[Blood transmission and infections]
1Avdeling for immunologi og blodbank, Regionsykehuset i Trondheim.
Summary
Blood transfusions carry inherent infectious risks, including known viruses and emerging threats like parvovirus B19. Careful consideration of transfusion necessity and potential immune modulation is crucial for patient safety.
Area of Science:
- Transfusion Medicine
- Infectious Diseases
- Immunology
Background:
- Blood transfusions are essential medical procedures but can never be entirely risk-free.
- Infectious agents, including viruses, bacteria, and parasites, can be transmitted via blood products.
- Focus has historically been on hepatitis and HIV, but emerging agents like parvovirus B19 and travel-associated parasites (malaria, Chagas' disease) pose increasing concerns.
Purpose of the Study:
- To highlight the persistent and evolving infectious risks associated with blood transfusions.
- To emphasize the importance of vigilance for both known and novel infectious agents.
- To discuss the immunomodulatory effects of transfusions and their potential impact on patient outcomes.
Main Methods:
- Review of current knowledge on transfusion-transmitted infections.
- Consideration of emerging infectious threats and travel-related risks.
- Discussion of transfusion-related immunomodulation (TRIM) and its implications.
Main Results:
- Blood transfusions remain a potential route for transmitting a wide range of infectious agents.
- International travel increases the risk of introducing blood-borne parasitic infections.
- Allogeneic transfusions, particularly those containing leukocytes, can modulate the immune system, potentially increasing secondary infection risk.
Conclusions:
- Blood transfusions inherently carry a small but significant risk that necessitates careful clinical judgment.
- Maintaining national self-sufficiency in blood products aids in controlling infectivity.
- Further research is needed to fully understand the long-term impact of transfusion-mediated immunomodulation, especially concerning malignant diseases.