Where can I apply for the new two-year seafarers' health certificate and vaccination yellow certificate in Zhengzhou? How much is it altogether?

There is an entry-exit inspection and quarantine center here in Zhengzhou, which runs a health certificate valid for one year, ten years for yellow fever and three years for cholera. The health certificate that you mentioned is valid for two years, and it is a hospital designated by the Maritime Safety Administration. You can check it on the website of the Maritime Safety Administration. There is one in Xinxiang, which I handled in Lianyungang Oriental Hospital. You can come out on an urgent day. The health examination should probably be conducted in 640 yuan and 260 yuan, a hospital designated by the Maritime Safety Administration.