The number of people diagnosed with a rare form of meningitis in the United States, has risen to 50.<br /><br />At least five people have already died in the outbreak that has spanned seven US states.<br /><br />The victims fell ill after receiving steroid injections for chronic back pain. <br /><br />It is believed the pain medications, produced in less regulated "compound pharmacies", were contaminated by an airborne fungus introduced in the mixing process.<br /><br />Al Jazeera's Kimberly Halkett reports from Washington.
