They just gave a figure.    So no discussion of makeup or how caught.
However I would doubt that any of those security guards would have been in today's figures.  They would have been infected over a month ago.
PS.
For a bit of a clue as to some of the workers, from today's Vic DHHS report:
Cases currently linked to key outbreaks are as follows:
- 169 cases have been linked to Al-Taqwa College
 
- 53 cases have been linked to Somerville Retail Services in Tottenham
 
- 35 cases have been linked to JBS in Brooklyn
 
- 6 cases have been linked to Australian Lamb Company in Colac 
 
- 3 cases have been linked to Australian Pharmaceuticals Industries in Dandenong
 
- 3 cases have been linked to Dairy Country in Tullamarine
 
- 6 cases have been linked to Goodman Fielder Pampas in West Footscray
 
- 6 cases have been linked to Warringal Hospital Heidelberg
 
- 10 cases have been linked to St Basil’s Home for the Aged in Fawkner
 
- 38 cases have been linked to Estia Health in Ardeer
 
- 24 cases have been linked to Glendale Aged Care facility in Werribee
 
- 12 cases have been linked to Embracia Aged Care Moonee Valley in Avondale Heights
 
- 4 cases have been linked to Japara Central Park Aged Care in Windsor
 
- Three new nursing homes have reported cases, with single cases now linked to Bluecross Ruckers Hill in Northcote, Villa Maria Catholic Homes in Alphington and Japara Highbury in Glen Waverley.