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Can a blood donor in Missouri get Chagas Disease from donating blood?

high confidence  ·  Last reviewed May 22, 2026

Yes, a blood donor in Missouri can transmit Chagas disease if they carry the parasite. In 2017, a person in Missouri donated blood that tested positive for antibodies to Trypanosoma cruzi, the parasite that causes Chagas disease. This case is considered the first documented autochthonous case of Chagas disease in Missouri 3.

What the research says

The 2017 Missouri case involved a blood donation that screened positive for antibodies to Trypanosoma cruzi 3. This finding indicates that the donor had the parasite and could potentially pass it through their blood to a recipient 3. The case highlights that Chagas disease can occur in non-endemic areas like Missouri, likely due to travel or immigration 3.

Chagas disease is a neglected tropical illness caused by Trypanosoma cruzi, which can lead to serious heart problems 2. Patients with Chagas cardiomyopathy often have arrhythmias and higher risks of hospitalization and mortality 12. The presence of the parasite in a donor's blood means they can transmit the infection to others through blood transfusion 3.

The 2017 case in Missouri underscores the importance of screening blood donations for Chagas disease, especially in areas where the disease is not common 3. This screening helps prevent transmission to recipients who may not have been exposed to the parasite before 3.

What to ask your doctor

  • Should I be tested for Chagas disease before donating blood if I have traveled to or lived in an endemic area?
  • What are the risks of receiving a blood transfusion if the donor has Chagas disease?
  • How often is blood screened for Chagas disease in Missouri?
  • What symptoms should I watch for if I suspect I have Chagas disease before donating blood?

This question is drawn from common patient questions about Infectious Disease and answered using cited medical research. We do not provide individualized advice.