Precautions for the second vaccination include precautions before vaccination (carrying ID card, making appointment in advance, etc.) and precautions after vaccination (staying for 30 minutes, avoiding spicy and stimulating food, etc.). Precautions before vaccination are: bring your ID card, make an appointment in advance, eat appropriately on the day of vaccination (avoiding empty stomach or full stomach), do not drink alcohol before vaccination, and do not take anti-inflammatory drugs, painkillers, antipyretics, and so on. Precautions after vaccination are: stay at least 30 minutes (due to individual allergies to certain components of the vaccine, allergic reactions may require medical staff to rescue), try to avoid bathing within 24h to cause infection of the needle mouth, avoid eating spicy and stimulating food, alcohol, strenuous exercise.