G-CSF responsiveness and the risk of infection for different durations of neutropenia. The figure depicts the risk of infection during a short versus a longer duration of neutropenia. In 53 cases with neutropenia (< 500/μL), duration was 3-5 days for all the cases and for subgroups with respect to G-CSF responsiveness. In 32 cases with neutropenia (< 500/μL), duration was 6-9 days.