Can I use IgA as an epidemiological marker?

IgA can be used as an epidemiological marker in various contexts. For example, elevated levels of IgA in mucosal secretions can indicate mucosal immunity and infection. It is useful in identifying diseases like celiac disease, where IgA antibodies against tissue transglutaminase are elevated. In epidemiological studies, monitoring IgA levels can help in understanding the prevalence and impact of certain infections and autoimmune conditions.