Test Details: Haemophilus influenzae B is a major cause of bacterial meningitis and other invasive diseases in children. H. influenzae B may cause disease such as meningitis, blood stream infection, pneumonia, arthritis etc. Haemophilus Influenza type B IgG antibody response is used for assessing patient's immunological response to HIB vaccine, assessing immunity against HIB, evaluation of immunodeficiency when patient is tested pre and post vaccination.