Serum antibodies against native and denaturated hemagglutinin glycoproteins detected by ELISA as correlates of protection after influenza vaccination in healthy vaccinees and in kidney transplant recipients.

Highlights: [•] Two ELISA assays are analyzed as correlates of immunity after influenza vaccination. [•] Antibodies against unfolded recombinant and against native hemagglutinin are detected. [•] Results are compared to microneutralization titers. [•] Healthy individuals and patients after kidney transplantation are investigated. [•] Both ELISA assays are correlated with microneutralization titers and can serve as markers of protection. [ABSTRACT FROM AUTHOR]