IMMUNITY ACQUIRED BY NATURAL MEANS 433
Immunity acquired after recovery from infective diseases.—Immunity
acquired in malaria.—Humoral properties of convalescents from
typhoid fever.—Preventive power of the blood of persons who have
recovered from Asiatic cholera.—Antitoxic power of the blood of
persons who have recovered from diphtheria.
Immunity acquired by heredity.—Absence of hereditary immunity
properly so called.—Immunity conferred by the maternal blood and
by the yolk.
Immunity conferred by the milk of the mother.