California neonatology immunology infectious and communicable disease pediatrics expert witnesses are physicians who assess neonatal infections, immune dysfunction, and communicable disease management in newborns. Many practice in NICUs at UCLA Health, UCSF, or major California children’s hospitals, with subspecialty training in pediatric infectious disease or immunology. They commonly evaluate sepsis, congenital infections, vaccine-preventable outbreaks, and NICU infection-control standards.