Patients are generally advised not to bathe for 3 days after the vaccination. This is because a bath at this time may lead to localized water exposure in the eye of the needle, leading to an infection. If the needle eye becomes infected, it may cause the vaccination to fail, and it may also affect the effectiveness of the vaccine and may cause the patient to develop systemic symptoms such as fever. Therefore, patients are advised not to take a bath for 3 days, and to do so after the local needle eye has completely healed, which can effectively avoid infection. In addition, if the patient must take a bath due to special circumstances, the eye of the needle must be protected, for example, a waterproof baby navel patch can be applied to the eye of the needle to effectively prevent the bathing sewage from staining the eye of the needle, which can effectively reduce the infection of the eye of the needle caused by water in the bath, thus effectively ensuring the effectiveness of the vaccine.