 The university asks everyone in the neighborhood to participate in a bacteriological study on the presence of staphylococci in Flemish kitchens. Originally Jeanne pretended Jeff was very sick to avoid it, but after Mimi said anyone not taking part will have a dirty reputation for life she makes med student Gentil, who was looking for an excuse to lock up Hugo during his bad cold, get her in. On her hypochondriac mothers advice, the house becomes practically quarantined, with an OR dress code. After Dieter tells Jef and Odilon that ninefold angling club champion Gerard s secret ingredient is just cough syrup, they make him invent a triple mix, but totally mess up the proportions, and mingle it with the cough syrup- just on the morning of the scientific scan, the brew fumes...