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

The boy has very low levels of IgA antibodies, which patrol mucous membranes and help prevent infections there.

From Science News

She and colleagues found that the Moderna vaccine may make more IgA antibodies, the type that help protect mucous membranes in the nose, mouth and other slick surfaces in the body from infection, than the Pfizer vaccine does.

From Science News

His truck parked in front of the deli just east of the IGA—obviously the next stop on his route.

From The Daily Beast

On examining the text the student can not fail to be struck by the great number of verbs ending in iga.

From Project Gutenberg

I was compelled, on emergencies, thereafter to use the ei-iga of some stray Mongol, which went much against the grain.

From Project Gutenberg

With eyes still turned away, she only says, “Go-iga” (in the forest).

From Project Gutenberg

To the valued suggestion of Tatéwaki, Iga no Kami nodded assent.

From Project Gutenberg