"Doctor, are you saying someone did this to me?"
The patient asked anxiously.
"Uh... well, it's not someone who did this to you. Think carefully, did you eat anything cold that wasn't heated, which your wife and kids didn't eat?" Liu Banxia asked.
"Didn't we all eat it?" The patient replied hesitantly.
"Beef, you ate the beef stew, the child and I didn't eat it because we saw there was fat on top." The patient's wife reminded him.
"But we all ate that beef, just not later on." The patient said.
"That sounds about right, your situation could be an infection caused by Listeria bacteria." Liu Banxia said.
"This bacterium, you see, is often called the hidden killer in refrigerators because it can grow even in the cold environment of a fridge."
"Doctor, does that mean our fridge is full of bacteria?" The patient's wife couldn't stay calm.
