Opportunistic viral infection Unusual VZV infection Unusual lower respiratory tract infection VZV pneumonitis VZV pneumonitis is a severe complication of primary varicella or disseminated zoster, characteristic of T-cell deficiencies and immunosuppressed hosts, and may present with hypoxia, diffuse pulmonary nodular infiltrates, and respiratory failure. Pneumonitis caused by varicella-zoster virus (VZV) infection that occurs in the context of unusual susceptibility to infection. VZV pneumonia Varicella-zoster virus pneumonitis