So they do not want to tell us this but they have just told us?
Anyone can have a reaction to anything that is foreign to their bodies, it is called an anaphylaxis, and that is why all health professionals that administer vaccines have epipens or their equivalent ready to use. Peanut allergy sufferers can die from ingesting micrograms of peanuts and they carry these pens with them.
We were told on day 3 that 2 health workers had bad reactions but adrenaline injections meant they recovered quickly.
More false information to back-bite the health service, well done and next time you need physical medical treatment, stay home a self treat!