PMC

Temporal trends of multidrug-resistant (MDR) Acinetobacter baumannii acquisition. Each row corresponds to a different nursing home resident and each column represents a follow-up visit. The mean length of stay prior to visit 0 among these residents was 657 days. White squares correspond to a follow-up day during which residents were not colonized with MDR A. baumannii; gray squares correspond to days in which swab specimens were not collected or days for which that resident was lost to follow-up. An X represents MDR A. baumannii colonization; an asterisk indicates recurrent MDR A. baumannii colonization.