system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 20-month-old boy is brought to the emergency department by his parents with fever and diarrhea that have persisted for the past 2 days. He has a history of repeated bouts of diarrhea, upper respiratory tract infections, and failure to thrive. His vital signs are as follows: blood pressure 80/40 mm Hg, pulse 130/min, temperature 39.0°C (102.2°F), and respiratory rate 30/min. Blood tests are suggestive of lymphopenia. The child is diagnosed with severe combined immune deficiency after additional testing. Which of the following is the most common association with this type of immunodeficiency?
assistant
X-linked severe combined immunodeficiency