Tier 1 - Anyone who has visited these sites during these times must immediately isolate, get a COVID test, and remain isolated for 14 days:

* Altona North - TIC Group (front office) at 232 Blackshaws Rd, all day on Thursday, May 6

* Melbourne CBD - Curry Vault Indian Restaurant and Bar at 18-20 Bank Place, between 6.30pm and 9.30pm on Friday, May 7

* Epping - Indiagate Spices and Groceries at Unit 14C/560-590 High St, between 5pm to 6pm on Saturday, May 8

* Epping - Woolworths Epping, cnr Cooper and High St in Epping, between 5.40pm and 6.38pm on Saturday, May 8

Tier 2 - Anyone who has visited these sites during these times must immediately isolate, get tested and stay isolated until you receive a negative result.

* Altona North - TIC Group (rear warehouse section) at 232 Blackshaws Rd, all day on Thursday, May 6

* Epping - 7-Eleven at 705 High St (corner Cooper St), between 6.30pm and 7.00pm on Thursday, May 6

* Epping - 7-Eleven at 705 High St (corner Cooper St), between 11.10am and 11.40am on Saturday, May 8

* Metro Train - Craigieburn to Southern Cross service between 5.28pm and 6.07pm on Friday, May 7

* Metro Train - Flinders St to Craigieburn service between 10.20pm and 11.05pm on Friday, May 7

Tier 3 - Anyone who has visited these sites during the times listed should monitor for symptoms. If symptoms develop, immediately get tested and isolate until you receive a negative result.

* Craigieburn - railway station between 5.23pm and 5.28pm on Friday, May 7

* Docklands - Southern Cross railway station between 6.07pm and 6.22pm on Friday, May 7

* Melbourne CBD - Flinders St railway station 9.50pm and 10.50pm on Friday, May 7.

Australian Associated Press