Fig. 27. Two clusters of bacterial conjunctivitis in a newborn nursery due to erythromycin-resistant Staphylococcus aureus spread by a nurse with chronic nasopharyngeal colonization, Minnesota, 1987-1988. (Hedberg K, Ristinen TL, Soler JT, et al: Outbreak of erythromycin-resistant staphylococcal conjunctivitis in a newborn nursery. Pediatr Infect Dis J 9:268, 1990)