The beef tapeworm, scientifically known as *Taenia saginata*, is a parasitic flatworm that primarily infects humans through the consumption of undercooked or raw beef. This tapeworm can grow up to 25 meters long and resides in the intestines, where it absorbs nutrients from the host's food. Infection with the beef tapeworm can lead to a condition called taeniasis, which may cause mild symptoms such as abdominal pain, nausea, and diarrhea. Proper cooking of beef to an internal temperature of at least 63°C (145°F) can effectively kill the larvae and prevent infection.