Disruption of the Genes for ClpXP Protease in Salmonella enterica Serovar Typhimurium Results in Persistent Infection in Mice, and Development of Persistence Requires Endogenous Gamma Interferon and Tumor Necrosis Factor Alpha

↵* Corresponding author. Mailing address: Division of Microbiology, Faculty of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. Phone: 81-43-290-2928. Fax: 81-43-290-2929. E-mail:tomoko-y{at}p.chiba-u.ac.jp.