Final answer:
The illness associated with undercooked shell eggs is Salmonellosis, which is caused by Salmonella bacteria.
Step-by-step explanation:
The illness associated with undercooked shell eggs is option A) Salmonellosis. Salmonellosis is caused by the bacterium Salmonella, and consuming undercooked or raw eggs contaminated with this pathogen is a common source of infection. Salmonella can be present on the eggshell or inside the egg, and when the egg is not properly cooked, the bacteria can survive and cause illness when ingested. Symptoms of salmonellosis include diarrhea, abdominal cramps, nausea, vomiting, fever, and headache. It is essential to practice proper food safety measures, such as cooking eggs thoroughly, to minimize the risk of Salmonella infection and other foodborne illnesses associated with raw or undercooked eggs.