Of those (N = 17) who had some sort of illness, most students (N = 8) had Glucose 6-phosphate dehydrogenase (G6PD) deficiency, some (N = 4) had sickle cell disease (SCD), others had diabetes (N = 1), asthma (N = 1), rheumatoid arthritis (N = 1), hypertension (N = 1) and irritable bowel syndrome (N = 1) (Table 1). The gene discussed is G6PD; the disease is Schnyder corneal dystrophy.