Which condition is characterized by recurrent bacterial infections and delayed detachment of the umbilical cord?

• A. Severe combined immunodeficiency
• B. Leukocyte adhesion deficiency type 1
• C. Hyper-IgM syndrome
• D. Common variable immunodeficiency

Answer: (B)

Leukocyte adhesion deficiency type 1 is characterized by recurrent bacterial infections and delayed detachment of the umbilical cord due to a defect in the integrins required for the adhesion of white blood cells to the endothelium. In this condition, neutrophils are unable to migrate effectively to sites of infection, leading to an increased susceptibility to infections, particularly with encapsulated bacteria.

The delayed detachment of the umbilical cord occurs because neutrophils, which play a crucial role in the inflammatory response and wound healing, are deficient in their ability to travel to the site of the umbilical cord stump and manage the bacterial flora that might be present. This results in a failure to clear the pathogens effectively, prolonging the time it takes for the cord to separate.

In summary, the specific defect in leukocyte adhesion in this condition directly correlates with the recurrent infections and the clinical presentation regarding the umbilical cord, making this option the correct choice.