The frequency of PC pneumonia among HT patients is the same as the frequency of PC infection in the general population. This observation and the long interval between transplantation and the development of PC pneumonia observed in the study support the hypothesis that the occurrence of PC pneumonia in immunocompromised patients might be from a new infection rather than from the reactivation of latent organisms. Therefore, continuous prophylaxis might be indicated in areas with a high prevalence of PC for patients at highest risk.
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