Most of the 125 people who tested positive for coronavirus at the Hemelrijck Nursing Home in Mol were infected by the same source, virologist Marc Van Ranst said on Twitter on Friday.
Eighteen deaths have already been registered at the nursing home.
According to the latest tests conducted by the University of Leuven, 97 residents, 17 members of staff and the visiting Saint Nicholas himself carry the same strain of the virus.
Three other strains have been detected among 10 other residents.
However, it cannot be established with any certainty that the infections were caused by the Saint Nicholas who visited the establishment on 4 December.
The Brussels Times