Some causative agents are notified to us through Sheild or Oasys and we don't know what they are. There are also some agents we discover for the first time which are initially a mystery. Such agents are listed in this section.
The Oasys Audit scheme started midway through 2010 and collects agents typed in through the Oasys program. The years before 2010 show old data entered during 2010 or later and are likely to have many fewer notifications. We expect Oasys to become more widely adopted as time goes by so increasing notifications does not necessarily mean an increasing problem.