Why did everyone Get sick after eating the pork second day?

It's likely the pork wasn't properly refrigerated or reheated, allowing bacteria to grow and multiply, causing food poisoning. Consuming pork that hasn't been handled, stored, or cooked safely can lead to various types of foodborne illnesses, such as salmonella or E. coli infections. Symptoms typically develop within a few hours to a few days and can include nausea, vomiting, diarrhea, abdominal pain, fever, headaches, and muscle weakness.