IgG Serum Antibodies to Shigella sonnei Lipopolysaccharide Are Inversely Associated with the Incidence of Culture-Proven S. sonnei Shigellosis in Israeli Children and Adolescents av Asato, V, Bassal, R, Meron-Sudai, S, Goren, S, Keinan-Boker, L, MacLennan, CA, Cohen, D