Both Y. pseudotuberculosis and Y. enterocolitica can cause foodborne illness, although infections caused by the latter organism are more common. A thorough description of the disease and causative bacteria can be found at http:// vm.cfsan.fda.gov/~mow/chap5.html. Briefly, these organisms enter the host by the oral route where they gain access to the mesenteric lymph nodes. Generally, the infection does not progress beyond this point except in immunocompromised individuals. In rare cases, the organism can infect deeper tissues and cause bacteremia. More typically, infection results in fever, diarrhea, and abdominal pain. Finally, some strains of Y. enterocolitica produce a heat-stable enterotoxin (Yst) as indicated in Table 1. However, the role this toxin plays in virulence is unclear because stains lacking it are virulent.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.