Neonatology immunology infectious and communicable disease pediatrics expert witnesses practice in a variety of fields, including newborn care, pediatric infections, immune disorders, and hospital epidemiology. Some of the most common specialties include sepsis in neonates, vaccine-preventable diseases, congenital infections, and pediatric immunodeficiency. They can opine on the effects of delayed diagnosis, improper infection control, vaccination errors, and substandard neonatal infectious disease care.