It is not always possible to kill bacteria after heating leftovers.
Leftovers are not able to kill bacteria and viruses inside these foods by heating them up if the heating temperature is not high enough. Meanwhile, because bacteria and viruses are different types of pathogens with different heat resistance, it is not possible to kill all pathogens by heating them up.
Eating leftovers may be infected with Salmonella, Helicobacter pylori, Hepatitis A virus, dysentery bacillus, etc., which may lead to gastrointestinal diseases.
So it’s best to use high heat or boiling when warming up your meal and to be able to keep it going for a few minutes or so. But to be safe, it is recommended not to eat leftovers, leftovers, it is better to eat fresh meals, which is more conducive to health.