A second salmon farm in B.C. is now under an official quarantine over concerns about a virus.

Grieg Seafood announced last week it had voluntarily isolated a coho farm near Sechelt, B.C., after a routine test identified a "low-positive result" for the virus known as IHN.

The virus does not affect human health or food safety but poses a risk to aquatic animal health.

The company says in a statement that the Canadian Food Inspection Agency quarantined the farm Tuesday afternoon.

Grieg Seafood says it also awaiting further tests to confirm whether the virus is actually present.

Earlier this week, Mainstream Canada announced it had culled more than 560,000 fish from a Vancouver Island farm and sent them to a composting facility after an outbreak of the virus near Tofino.