A prospective study of the impact of community-based azithromycin treatment of trachoma on carriage and resistance of Streptococcus pneumoniae Clin Infect Dis - Leach,A.J.; Shelby-James,T.M.; Mao,M.; Gratten,M.; Laming,A.C.; Currie,B.J.; Mathews,J.D. (1997)