Is my food safe to eat if I've seen signs of mice?

All food should be kept in sealed, rodent-proof container such as Tupperware. If you believe a mouse has accessed your food (from food particles, gnaw marks, ripped bags, etc.) the safest option is to completely dispose of the affected food. If the bag/container is still sealed and you wish to keep it, ensure you soak the container in a diluted bleach solution prior to consumption. See more here.