IgA (Immunoglobulin A)

Immunoglobulin A (IgA) is a type of antibody that plays a key role in the immune system’s first line of defense, especially at mucous membranes like the mouth, nose, and digestive tract. It helps prevent harmful pathogens, such as bacteria and viruses, from attaching to and infecting the body's surfaces. IgA is found in secretions like saliva, tears, and mucus, acting locally to protect these areas. It also circulates in the blood, providing additional immune support. Overall, IgA is essential for maintaining mucosal health and preventing infections at points where the body contacts the environment.