W hen President Trump used a White House press conference to ponder out loud as to the potential solutions to the Covid-19 crisis, including ultraviolet light and injections of disinfectant, cameras zoomed in on the face of the US government’s coronavirus response coordinator, Dr Deborah Birx.

Dr Birx’s non-verbal reaction to the president’s suggestions – which are at best ineffective, at worst more deadly than the virus itself – has sparked memes and raised questions.