The Louisville Metro Department of Public Health and Wellness begins a series of walk-in flu shot clinicsthis week.Starting Thursday, residents can visit firehouses and other sites across the city to get an immunization, which this year includes both the seasonal flu and H1N1 vaccine.There's also push by health officials to vaccinate more African-Americans, who accounted for 35 percent of flu-related hospitalizations across the country last year.Church leaders are joining the effort this year to spread the word, among them the Reverend Frank Smith."We're asking for pastors to take a time in these next few weeks to specifically address from the pulpits and in your teaching formats the necessity of our faith community to participate in this effort," he said.The health department says there is an ample supply of flu vaccine this year.More flu information at wfpl.org/flu