The chances of a clean kitchen knife in your home having Clostridium tetani are very small, but if the cut is deep, you still need a tetanus shot. Clostridium tetani is an anaerobic bacterium that is often found in an anaerobic environment deep in the soil. Therefore rusty nails and soil-stained items have a higher probability of having Clostridium tetani on them. A clean kitchen knife in the house has no soil in the first place, and no anaerobic environment can be formed on it, so it is less likely to have Clostridium tetani. Clean kitchen knives at home may also be contaminated with other pathogens if they have cut raw meat and other ingredients. Therefore, when your hand is cut by a kitchen knife at home, you need to rinse the wound in a timely manner, apply iodine povidone to disinfect it, try not to wrap it too tightly, and change the medicine frequently to avoid pus infection of the wound. If the cut is deep and bleeding, tetanus vaccination is still recommended. Therefore, in general, cuts by household clean kitchen knives and shallow wounds may not be vaccinated against tetanus.