Vaccines are complex biological products, and manufacturing them can be a lengthy process (1). Quality controls throughout ensure vaccines are produced using the highest possible standards. These controls, which can represent up to 70% of the overall manufacturing time (1), ensure the end product is a high-quality, safe and efficacious vaccine.
The most common way that flu vaccines are made is using an egg-based manufacturing process that has been used for more than 70 years (2). Let’s take a look: