Compléter immunoglobulin fill inVersion en ligne immunoglob par kenneth thomas 1 saliva M IgE G lungs breastmilk viral A bacterial allergic E D Immunoglobulin , which is found in high concentrations in the mucous membranes , particularly those lining the respiratory passages and gastrointestinal tract , as well as in and tears . . Immunoglobulin , the most abundant type of antibody , is found in all body fluids and protects against and infections , transferred via placenta . Immunoglobulin , which is found mainly in the blood and lymph fluid , is the first to be made by the body to fight a new infection . Immunoglobulin ( ) , which is associated mainly with reactions It is found in the , skin , and mucous membranes . Immunoglobulin , which exists in minute amounts in the blood , is the least understood antibody .