IgA
noun
1
: a class of immunoglobulins including antibodies found in external bodily secretions (such as saliva, tears, and sweat)
2
: an antibody of the class IgA
Examples of IgA in a Sentence
Recent Examples on the Web
But when delivered at mucosal sites, vaccines can also produce local antibodies, such as IgA, which coat mucosal membranes in the nose, throat, and lungs; creating a first line of defense.
—
New Atlas, 9 Aug. 2025
Both prebiotics and probiotics can increase immunoglobulin A (IgA).
—Jessica Swirble, Verywell Health, 5 Aug. 2025
In the blood, two types of antibodies (IgA and IgG) increased by several fold after vaccination compared with the placebo group.
—Ars Technica, 6 Mar. 2025
Living With IgA Nephropathy In terms of overall prognosis, individual cases of IgA nephropathy vary.
—Mark Gurarie, Health, 30 Sep. 2024
What about the company Vertex didn’t buy? Vertex Pharmaceuticals’ decision to pay $4.9 billion for Alpine Immune Sciences cast a spotlight on the severe kidney disease IgA nephropathy — and, by extension, a company called Vera Therapeutics.
—Damian Garde, STAT, 12 Apr. 2024
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New Atlas, 9 Aug. 2025
Both prebiotics and probiotics can increase immunoglobulin A (IgA).
—Jessica Swirble, Verywell Health, 5 Aug. 2025
In the blood, two types of antibodies (IgA and IgG) increased by several fold after vaccination compared with the placebo group.
—Ars Technica, 6 Mar. 2025
Living With IgA Nephropathy In terms of overall prognosis, individual cases of IgA nephropathy vary.
—Mark Gurarie, Health, 30 Sep. 2024
What about the company Vertex didn’t buy? Vertex Pharmaceuticals’ decision to pay $4.9 billion for Alpine Immune Sciences cast a spotlight on the severe kidney disease IgA nephropathy — and, by extension, a company called Vera Therapeutics.
—Damian Garde, STAT, 12 Apr. 2024
Cite this Entry
“IgA.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/IgA. Accessed 4 Nov. 2025.
Copy CitationMedical Definition
IgA
noun1
: a class of immunoglobulins that include antibodies found in external bodily secretions (as saliva, tears, and sweat)
2
: an immunoglobulin of the class IgA
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