ER, emergency room; ICU, intensive care unit; AIIR, airborne infection isolation room; MLT, medical laboratory technologist; IC, infection control; Admin, administration; IgA, immunoglobulin A; IgM, immunoglobulin M; IgG, immunoglobulin G; N*, total number of samples; n, total number of positive samples. This evidence concerns the gene CD40LG and infection.