Anti-HIV IgA isotypes: differential virion capture and inhibition of transcytosis are linked to prevention of mucosal R5 SHIV transmission.

Objective Although passive immunization with anti-HIV-1 Env IgG1 neutralizing monoclonal Abs (nmAbs) prevented simian-human immunodeficiency virus (SHIV) infection in rhesus monkeys (RMs), IgA nmAbs have not been tested. Here, we sought to determine whether human anti-HIV-1 dimeric (d)IgA1, dIgA2, and IgG1 differ in their ability to prevent mucosal R5 SHIV acquisition in RMs.