If you have any concerns about your health or the possibility of needing a tetanus shot, it is essential to seek advice from a healthcare professional. They will be able to evaluate your specific situation and provide the most appropriate advice and treatment.
In general, tetanus is caused by a bacterial infection (Clostridium tetani) that can enter the body through open wounds, particularly deep or puncture wounds. Stepping on a glass shard, even if it didn't cut you or go inside your foot, may still cause a small wound or abrasion that could allow the bacteria to enter your body.
If you haven't received a tetanus vaccination within the past ten years or if you are unsure of your vaccination status, it's generally recommended to get a tetanus shot, especially if you have a potential exposure to the bacteria.
Again, please consult a healthcare professional who can assess your situation and provide personalized advice based on your medical history and the specific circumstances of the injury. They will be able to determine whether a tetanus shot is necessary and if any further medical attention is required.