According to the CDC, it is best to visit a doctor at least four to six weeks before you leave your country. For the reason that if you are in need of taking vaccines or any other medicines, early appointment with your doctor will not only provide you the time for vaccines to take effect but also it will allow time to start taking medicines to prevent any other infectious disease.
Vaccines needed for China
According to CDC, the recommendations for vaccine usually depend on the best available information on risk level. It is necessary for you to know that at any time, the risk level for vaccine-preventable diseases can alter. Although, China is not risk zone for Yellow Fever, but the Chinese government requires a proof of vaccination for Yellow Fever. However, this proof of vaccination requires only when you are transiting through a country that is in the high-risk area for yellow fever.