If you have just received a booster shot and have a cold, it may be an adverse reaction to the vaccine, or it may be caused by a bacterial or viral infection, and treatment for the cause can be given. Symptoms of cold after vaccination may be an adverse reaction to the vaccine, such as fever, headache, muscle pain, etc. Most of these symptoms are mild and last for about a day. Most of these symptoms are mild and may resolve on their own within 1-3 days. If symptoms persist or worsen, medications such as ibuprofen can be used under medical supervision to relieve symptoms. Cold symptoms after vaccination may also be caused by bacterial or viral infection. At this time, it is necessary to improve the blood routine, C-reactive protein and other tests to clarify whether it is caused by bacteria or viruses. If it is caused by bacteria, antibiotic treatment, such as amoxicillin, is needed; if it is caused by a virus, medication can be given to relieve the symptoms, such as amoxicillin capsules. It is recommended to consult a doctor in time to avoid delaying the condition.