egg-based vaccine

An egg-based vaccine is a type of vaccine produced using fertilized chicken eggs. In this process, the virus that causes a specific disease, such as influenza, is injected into the eggs, where it multiplies. After a few days, the virus is harvested and then inactivated or weakened to create the vaccine. This method has been used for decades and is effective because the virus can replicate well in the egg environment. Egg-based vaccines are still commonly used for flu vaccinations and are critical for global health, although alternatives are being developed to reduce reliance on eggs.