Incidence of Severe COVID-19 Infection in Patients With CLL or B-NHL Who Received Pre-exposure Prophylaxis With Tixagevimab and Cilgavimab in Italy.

This is an observational retrospective and prospective multicenter study aimed at describing the role of the COVID -19 prophylaxis with Tixagevimab and Cilgavimab in CLL or indolent B-NHL patients. All CLL or indolent B-cell NHL patients (follicular lymphoma, marginal zone lymphoma, lymphoplasmacytic lymphoma) who received first COVID-19 prophylaxis dose with Tixagevimab and Cilgavimab according to AIFA indication between March 2022 and October 2022 will be included in the study. Each patient will be followed for a maximum of 12 months from the first COVID-19 prophylaxis dose.