Holby City fans have shared their concerns for Nicky McKendrick after the doctor was exposed to a deadly drug.During Tuesday’s instalment of The BBC One hospital drama, viewers were glued to their screens as the medical practitioner was targeted by a vengeful relative of one of Cameron’s victims.The brunette beauty received a sinister card claiming to be full of anthrax – which is a deadly drug that if inhaled can kill within a matter of days.Luckily, Jac Naylor realised the severity of the situation and urged the new mum to remain still while she raised the alarm around the hospital.And viewers soon swarmed to social media to share their concerns for the loveable character on the show.One user wrote: "Serial Killer Cameron is still on the loose.