A cook at a carnicería handles raw pork, then answers his cell phone, and returns to portion cooked carnitas. How many handwashing opportunities did he miss if he washed at none of these points?

Giải thích

He should have washed hands after handling raw pork (before touching anything else), and again after touching his cell phone, which is a contaminated non-food surface, before portioning the ready-to-eat carnitas. That is at least two missed handwashing points. Cell phones are not clean, and gloves worn earlier do not excuse washing between these contamination events.