How newborns fight off pathogens they've NEVER encountered

When a mammal is born, it is exposed to a world of microorganisms. All of which their immune system has never encountered. A newborn is extremely susceptible to infection in the first few weeks of their life. Thankfully, they get a little help from their mom through the passive transfer of antibodies and some T cells. How does this happen?

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References:

Tizard IR. 2013. Veterinary Immunology. 9th ed.

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