The Pfizer–BioNTech COVID-19 vaccine (INN: tozinameran), sold under the brand name Comirnaty, is an mRNA-based COVID-19 vaccine developed by the German company BioNTech. It is authorized for use in people aged 12 years and older in some jurisdictions and for people 16 years and older in other jurisdictions, to provide protection against infection by the SARS-CoV-2 virus, which causes COVID-19. For its development BioNTech collaborated with Pfizer, an American company, for support with clinical trials, logistics, and manufacturing. In China, BioNTech is partnered with China-based Fosun Pharma for development, marketing, and distribution rights and the vaccine is colloquially described as the Fosun–BioNTech COVID‑19 vaccine. The vaccine is given by intramuscular injection. It is composed of nucleoside-modified mRNA (modRNA) encoding a mutated form of the full-length spike protein of SARS-CoV-2, which is encapsulated in lipid nanoparticles. Vaccination requires two doses given three weeks apart.