Fig 2.

(a) Proportion of positive bacterial cultures yielding Pseudomonas as a function of time of culture collection in relation to hospital admission (in weeks), stratified by intensive care unit exposure category. (b) Proportion of positive bacterial cultures yielding Pseudomonas as a function of time of culture collection in relation to hospital admission (in weeks), stratified by antibiotic exposure category. After the second week of admission, very few admitted patients have not received antibiotics, and so estimates for this group are based on very small sample sizes for subsequent time points. (c) Proportion of positive bacterial cultures yielding Pseudomonas as a function of time of culture collection in relation to hospital admission (in weeks), stratified by sterile versus nonsterile cultures. (d) Proportion of positive bacterial cultures yielding Pseudomonas as a function of time of culture collection in relation to hospital admission (in weeks), stratified by respiratory versus nonrespiratory cultures.