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Salmonella entericaserotype 4,[5],12:i:− (STM) has become an increasing problem for food safety and has been often detected in swine products. Weanling pigs were exposed to STM-contaminated feed, water, or air to determine possible STMtransmission routes. A control group of pigs was included. STMwas monitored daily in feces and rectal and nasal swabs. STMcolonization was most prevalent in tissues from tonsil, lower intestine, and mesenteric lymph nodes. No differences in lesion severity were observed between inoculated and control pigs. Contaminated feed, water, and aerosolized particles caused infection in weaned pigs; however, no STMcolonization was observed in skeletal muscle destined for human consumption. Based on the results from this study, STMcontamination in pork products most likely results from cross-contamination of meat by digesta or lymph node tissue during processing.