It is best to get a tetanus shot within 24 hours of getting a nail stuck, and the incubation period for tetanus can be as short as 24 hours. The germ of tetanus infection is Clostridium tetani, an anaerobic bacterium that is distributed in nature in the state of spores and can be present on objects such as nails. When pierced by a nail, the wound may become infected with Clostridium tetani, especially in deeper wounds, which usually require tetanus toxoid antigen for prophylaxis. The incubation period of tetanus is usually 7~8 days, the shortest can be 24 hours onset, the longer incubation period can be a month or several years. Therefore, tetanus vaccine is generally recommended to be administered within 24 hours and is usually valid for 10 days. The appearance of nails piercing the skin, it is recommended to seek medical attention in a timely manner, under the guidance of a professional doctor, reasonable and standardized tetanus vaccination to prevent tetanus.