IgA

Immunology.

1. immunoglobulin A: a class of antibodies predominant in respiratory and alimentary tract secretions and in saliva and tears, functioning as the body's first line of defense against invading foreign substances especially by neutralizing viral antigens and by preventing the adherence of bacteria to mucous membrane surfaces.

Word History and Origins

Origin of IgA¹

First recorded in 1960–65

Example Sentences

Absence or low levels of mucosal IgA is known to be associated with an increased risk of SARS-CoV-2 breakthrough infections.

From Science Daily

Gommerman is intrigued by the potential for IgA antibodies in the nose and saliva as well.

From Science Magazine

Mounting evidence supports IgA antibodies as the key to preventing infection.

From Seattle Times

Eoin was first diagnosed with IgA nephropathy when he was in his late teens.

From BBC

Around 65 percent of the secretory IgA survives the trip through the stomach, Powell says, while less IgG survives the stomach.

From Salon