Preliminary results showed that a eosinophil increase during hospitalization could be a potential predictor of pulmonary sequelae in surviving patients after COVID-19 pneumonia.

Despite the protective role of eosinophils, their excessive activation can be associated with radiological sequelae after the acute phase of SARS-CoV2 infection. More extensive studies are needed to confirm our results.

Despite a general initial eosinopenia, we observed eosinophils rising in both COVID-19 severity groups, and unexpectedly, this increase was higher in HIMC patients.

Even though eosinophils are frequently associated with Th2 responses, their granules contain main Th1 cytokines such as interleukin (IL)-2, IL-12, and interferon-gamma.

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