(a,b) Bacteria in the spleens of Slamf1−/−Rag1−/− and Rag1−/− BALB/c mice (a) or Slamf1−/− and Slamf1+/+ BALB/c mice (b) 48 h after intraperitoneal injection of virulent S. typhimurium 14028s or attenuated S. typhimurium SseB−. CFU, colony-forming units; ND, not detectable. Data are representative of four independent experiments (mean and s.d.). 