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Reverted edits by Flipper (Talk); changed back to last version by Brian
Active immunity was the production of antibodies against a specific disease by the immune system. Active immunity can be acquired in two ways, either by contracting the disease or through vaccination.
Active immunity is the production of antibodies against a specific disease by the immune system. Active immunity can be acquired in two ways, either by contracting the disease or through vaccination.
Active immunity was usually permanent, meaning a individual was protected from the disease for the duration of their lives.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>
Active immunity is usually permanent, meaning an individual is protected from the disease for the duration of their lives.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>
==References==
==References==