Bacteria such as campylobacter, listeria, salmonella, etc, can survive acidity and thrive in a sealed jar, but, they can't survive a proper hot water bath processing.

Does canning kill bacteria?

In canning, you boil the food in the can to kill all the bacteria and seal the can (either before or while the food is boiling) to prevent any new bacteria from getting in. Since the food in the can is completely sterile, it does not spoil.

Can you cook salmonella out of food?

Does cooking kill salmonella? Thorough cooking can kill salmonella. But when health officials warn people not to eat potentially contaminated food, or when a food is recalled because of salmonella risk, that means don't eat that food, cooked or not, rinsed or not.