After finishing his days in the isolation ward, Lukwiya would sit with members of the WHO, CDC and other medical teams that had set up in the hospital compound to offer assistance and take blood samples that allowed them to map the course of the disease. His main question for them was how to stop his staff members from becoming infected. The likely explanation in most cases are momentary lapses. Health workers at St. Mary's worked 14 hours shifts for weeks in a row while in layers of protective clothing that were stifling in the equatorial country. All that would be required for infection is for a health worker to lose focus for a moment and, after touching a patient, slip a gloved finger under their mask to scratch an itchy nose or rub an eye. One infected St. Mary's health worker who may have been infected in this way was nurse Simon Ajok. In the early morning of 20 November, Ajok was in the Ebola ward and critical, bleeding from both his nose and gums. Fighting to breathe, Ajok pulled off his oxygen mask and coughed violently, sending a fine spray of blood and mucus against the nearby wall. He then astonished and terrified the night-shift by rising to his feet and staggering into the hallway. The night nurse on duty called Dr. Lukwiya for help. Woken out of bed, Lukwiya put on protective clothing, mask, cap, gown, apron and two pairs of gloves, but not goggles or a face shield to protect the eyes. Explanations for this range from grogginess at being newly awoken or haste to reach a colleague that he had helped train. While it will never be known for certain, the care for Simon Ajok, who died one hour after the physician arrived, is the most likely candidate for Lukwiya's infection.