A restaurant in Salisbury City Centre has been closed in connection with the on-going major incident.
Zizzi, on Castle Street, has been secured as a precaution by Wiltshire Police while the investigation continues.
Public Health England are aware of this and have reiterated that, based on the evidence to date, there is no known risk to the public's health.
However, as a precaution they have advised that if you feel ill contact NHS on 111. If you feel your own or another's health is significantly deteriorating, ring 999.