Which of the following bacteria cause intestinal infections usually within 6-72 hours after ingestion?

The bacteria that cause intestinal infections usually within 6-72 hours after ingestion are indeed typically associated with Salmonella. Salmonella infections can occur quickly after consuming contaminated food or water, leading to symptoms such as diarrhea, fever, and abdominal cramps.

Each of the other bacteria mentioned can cause foodborne illness, but their incubation periods vary. Listeria, for instance, has a much longer incubation period, often ranging from a few days to several weeks, which distinguishes it from the rapid response seen with Salmonella. Campylobacter additionally can cause symptoms that appear within 2 to 5 days, which does not fall within the specified time frame of 6-72 hours when considering the most common strains. Likewise, Yersinia typically causes infections that manifest within 4 to 7 days post-ingestion.

Understanding these timelines is crucial in food safety and HACCP training, as it helps in identifying potential sources and preventing outbreaks effectively. Thus, Salmonella is correctly identified as the bacterium associated with rapid onset of intestinal infection.