http://www.cchealth.org/topics/podcast/ Dr. Walker talks about issues pressing in Contra Costa County, California. en-us 2007 Fri, 04 Jan 2008 12:01:01 GMT 1 2007noDr. Walker talks about issues pressing in Contra Costa County, California. Contra Costa Health Services is a public agency. We're in the news a lot - encouraging people to get immunized against a disease, describing what happened during a refinery accident or appearing at the Board of Supervisors to talk about an urgent issue. Tues, 8 July 2008 17:17:23 GMT Contra Costa Health Services is a public agency. We're in the news a lot - encouraging people to get immunized against a disease, describing what happened during a refinery accident or appearing at the Board of Supervisors to talk about an urgent issue.Contra Costa Health Services is a public agency. We're in the news a lot - encouraging people to get immunized against a disease, describing what happened during a refinery accident or appearing at the Board of Supervisors to talk about an urgent issue.http://www.cchealth.org/z/mp3/podcast/2008_07_how_we_know.mp3 nonadult