Cilgavimab is a monoclonal antibody against the surface spike protein of SARS-CoV-2 [3
]. It was developed by AstraZeneca. This mAb blocks spike binding to ACE2 and prevents infection in animals. It is designed to be a long-acting agent, and in combination with tixagevimab
(co-packaged combination= Evusheld®), is proposed as a therapeutic for those people who are likely to respond poorly to SARS-CoV-2 vaccines, or who cannot be vaccinated for any reason, including those who are immunocompromised [1
]. Data from the Phase 3 PROVENT trial (NCT04625725) show protection from infection that lasts for at least six months. AstraZeneca have reported that Evusheld® retains neutralising activity against the BA.1 omicron (B.1.1.529) SARS-CoV-2 variant. Cilgavimab as a single agent rmore effectively neutralises the BA.2 omicron subvariant than tixagevimab in vitro
], so the combination retains neutralising activity.