| − | Arthritis is a medical condition characterized by inflammation of the joints which results in pain and difficulty moving.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref> | + | Arthritis is a medical condition characterized by inflammation of the joints which results in pain and difficulty moving.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref> Arthritis is a common condition among the eldery. |