Marcusde Brun is accused of 10 counts of professional misconduct over his criticism of vaccines, lockdowns, facemasks, and various public health guidelines.

Marcus de Brun repeated a claim made in a controversial tweet in July 2021 that injecting a child with a genetic-based vaccine was “a crime against humanity”

Marcus de Brun called for the evidence of an expert witness, Colin Bradley, who had concluded that the GP’s actions were “disgraceful and dishonourable”, to be excluded from the case against him.

An expert witness told a fitness-to-practise hearing of the Medical Council that Marcus de Brun, who operated his own medical practice in Rush, Co Dublin, had disagreed with all sorts of public health guidelines and initiatives in a large number of posts on his Twitter account.