what is IgA

Answer 1

IgA, or immunoglobulin A, is a type of antibody that plays a key role in the immune system's defense against infections. It is found in high levels in mucous membranes, such as those in the respiratory and gastrointestinal tracts, where it helps to neutralize and prevent the entry of pathogens into the body. IgA is also present in saliva, tears, and breast milk, providing protection against infections in these areas as well.