Natural passive immunity involves the natural passage of antibodies from a female to a child before and after birth. IgG is the only antibody class that can cross the placenta. Placental transfer of IgG can result in passive immune defense that can last up to six months after birth. Secretory IgA can also be transferred from to an infant through breast milk.

Austin Community College

Passive immunity refers to the transfer of antibodies from another individual or animal. Passive immunity can be described in 2 ways:
 - Artificial Passive Immunity
 - Natural Passive Immunity

Passive Immunity

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

Artificial Passive Immunity is achieved through the transfer of antibodies produced by a donor (human or animal) to another. This transfer of antibodies may be done to prevent disease after exposure to a pathogen or as a strategy for treating an active infection.

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