How long can the validity period last after a tetanus shot

Normally, after being scratched by rusty iron and rusty metal, there is a chance of infection with tetanus bacilli. At this time, timely injection of tetanus antitoxin is needed to prevent immunity. Generally, tetanus antitoxin injection can be effectively maintained for about 1 week. If it is more than this period, it is necessary to inject again to prevent scratches. The injection of tetanus immunoglobulin can produce immune effect after injection, the normal time is 2 weeks, generally not more than 3 weeks. Occasionally, a small number of patients can cause redness and pain after injection, and their symptoms are mild and do not need special treatment. They can recover and relieve themselves.