Eosinophilia during Hantavirus infection: a cohort study

Background There are emerging eosinophil-related considerations concerning viral infections. The role of eosinophils has poorly been evaluated during Hantavirus infection. Methods The aim of this study was to determine the prevalence of eosinophilia (defined as an eosinophil count above 500 cells/mm(3)) during haemorrhagic fever with renal syndrome (HFRS) in a large cohort of patients, and to identify factors associated with eosinophilia. Results Among 387 patients hospitalized for HFRS, 98 (25.3%) had eosinophilia. By univariate analysis, eosinophilia was significantly associated with more severe thrombocytopenia, high C-reactive protein level, white blood cell count and neutrophil count and lower nephrotoxic drug intake. As there was a collinearity between white blood cell count and C-reactive protein level, only C-reactive protein level with platelet count and nephrotoxic drug intake were entered in the multivariable analysis. Elevated C-reactive protein concentrations remained independently associated with eosinophilia. Conclusion Eosinophilia during HFRS affects one quarter of patients, and supports the role of eosinophils in antiviral immunity against hantavirus infection.

Automated summary

The study found that about one quarter of patients with HFRS had eosinophilia, which was associated with severe thrombocytopenia, high C-reactive protein levels, white blood cell count, and neutrophil count, and inversely associated with nephrotoxic drug intake. Elevated C-reactive protein concentrations were independently associated with eosinophilia, supporting the role of eosinophils in antiviral immunity against hantavirus infection.