Pharmaceutical giant AstraZeneca has admitted that its Covid-19 vaccine can cause a rare side effect known as Thrombosis with Thrombocytopenia Syndrome (TTS). The admission was made in court documents for the first time since the vaccine was rolled out. The company, which developed the vaccine in partnership with the University of Oxford, is facing a class-action lawsuit alleging that their vaccine has resulted in fatalities and serious injuries among recipients. Victims and grieving relatives are seeking damages estimated to be worth up to £100 million.