Campylobacter jejuni, a bacterium that causes nasty diarrhea "which may be watery or sticky and can contain blood"
Clostridium perfringens, another diarrhea-causing bacterium
Listeria monocytogenes, a bacterium that sometimes causes diarrhea, as well as fever, fatigue, and aches and is especially dangerous for pregnant women, babies, and people with compromised immune systems
Salmonella, a group of bacteria that cause fever and diarrhea
Staphylococcus aureus, a bacterium that is commonly found in around a quarter of us in our noses and on our skin, can withstand high cooking temperatures, and causes diarrhea and vomiting.