Zhifei's biological sales are easy to do. Chongqing zhifei Biological Products Co., Ltd. is an international biological high-tech enterprise integrating research and development, production, sales, distribution and import and export of vaccines and biological products. At present, there are some products on the market, such as recombinant novel coronavirus protein vaccine (CHO cell) (Zhikewei), recombinant Mycobacterium tuberculosis fusion protein (Yika), Mycobacterium bovis for injection (micro-card), tetravalent human papillomavirus vaccine (Saccharomyces cerevisiae), and nonavalent human papillomavirus vaccine (Saccharomyces cerevisiae).