The incident has badly affected two National Health Service (NHS) hospital trusts responsible for several of the capital’s busiest centers, including St Thomas’ Hospital, King’s College Hospital, Guy’s Hospital, Royal Brompton Hospital, and Evelina London Children’s Hospital.

By June 4, the hospitals started cancelling transplant operations and described blood transfusions as “particularly affected” in an internal memo written by Guy’s and St Thomas’ head, Professor Ian Abbs.

On the same day, Synnovis, a joint venture between the two health trusts involved and German medical testing and diagnostics company Synlab, acknowledged the attack.