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Trends in Hospitalizations Related to Invasive Aspergillosis and Mucormycosis in the United States, 2000-2013.

BACKGROUND: Invasive aspergillosis (IA) and mucormycosis contribute to substantial mortality, especially among immunocompromised persons, including those with hematopoietic stem cell transplant (HSCT), hematologic malignancy (HM), and solid organ transplant (SOT).

METHODS: Using International Classification of Diseases, Ninth Revision codes available in the National Inpatient Sample, a hospital discharge database, we estimated IA-related hospitalizations (IA-RH), mucormycosis-RH (M-RH), HSCT-RH, HM-RH, and SOT-RH during 2000-2013. United States census data were used to calculate overall M-RH and IA-RH rates and present trends; estimated annual numbers of HSCT-RH, HM-RH, and SOT-RH served as denominators to calculate M-RH and IA-RH rates occurring with these conditions. Weighted least-squares technique was used to test for linear trends and calculate average annual percentage change (APC).

RESULTS: There were an estimated 169 110 IA-RH and 9966 M-RH during 2000-2013. Overall, IA-RH and M-RH rates per million persons rose from 32.8 to 46.0 (APC = +2.9; P < .001) and 1.7 to 3.4 (APC = +5.2%; P < .001), respectively, from 2000 to 2013. Among HSCT-RH, there was no significant change in M-RH rate, but a significant decline occurred in IA-RH rate (APC = -4.6%; P = .004). Among HM-RH, the rate of M-RH increased (APC = +7.0%; P < .001), but the IA-RH rate did not change significantly (APC = +1.2%; P = .073). Among SOT-RH, M-RH (APC = +6.3%; P = .038) and IA-RH rates (APC = +4.1%; P < .001) both increased.

CONCLUSIONS: Overall IA-RH and M-RH rates increased during 2000-2013, with a doubling of M-RH. Mucormycosis-related hospitalization occurring in conjunction with certain comorbidities increased, whereas IA-RH rates among patients with the comorbidities, decreased, remained stable, or increased to a lesser extent than M-RH.

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