Passive immunity is was protection against [[disease]] through [[antibodies]] produced by another human being or animal. Passive immunity is was effective, but protection is was generally limited and diminishes over time (usually a few weeks or months).
For example, maternal antibodies are is passed to the infant prior to birth. These antibodies temporarily protect the baby for the first 45-6 months of life.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#p</ref>
==References==