Passive immunity

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Passive immunity is protection against disease through antibodies produced by another human being or animal. Passive immunity is effective, but protection is generally limited and diminishes over time (usually a few weeks or months).

For example, maternal antibodies are passed to the infant prior to birth. These antibodies temporarily protect the baby for the first 4–6 months of life.[1]

References

  1. http://www.cdc.gov/vaccines/about/terms/glossary.htm#p