egg based vaccines

https://www.creative-biolabs.com/vaccine/cell-based-vaccines.htm
Equipped with world-leading technology platforms and professional scientists, Creative Biolabs offers all kinds of vaccine development services including cell based vaccines. Cell based vaccine is a vaccine developed from mammalian cell lines rather than embryonic chicken eggs. Cell culture techniques are used as a complementary and alternative platform for current egg-based strategies. Potential applications in the development of viral vaccines, particularly influenza vaccine, have been extensively studied in recent years.