(AP Photo/Kamran Jebreili)

Two B.C. oyster farms closed by norovirus

Officials report 40 cases of the illness in the past month after people had eaten raw oysters

Health officials in British Columbia have closed two oyster farms amid an investigation into another outbreak of norovirus linked to the consumption of raw oysters.

The BC Centre for Disease Control says there have been about 40 cases of the acute stomach upset since early March and all those who became ill reported eating raw oysters from B.C.

READ MORE: Tofino faces shellfish closures after norovirus outbreak hits 120

READ MORE: Ocean currents tied to B.C. norovirus outbreak: CDC

The centre says laboratory testing confirms the presence of norovirus in some of the cases and the illness is suspected in the rest of those who have become ill.

An exact source of the contamination has not been determined but the centre says human sewage in seawater is the most likely cause.

Nearly 350 cases of norovirus linked to raw or undercooked B.C. oysters were reported in B.C., Alberta and Ontario starting in late 2016 and continuing through early 2017, forcing the closure of 13 oyster farms on the B.C. coast.

That outbreak was declared over in April 2017, and an article published the British Columbia Medical Journal last June determined sewage spread by ocean currents caused the widespread contamination.

Researchers concluded the outbreak disproved claims that shellfish is safe to eat between September and April, and noted that bacteria, viruses and biotoxins persist in cold sea water year-round.

The centre says it does not recommend eating raw oysters and advises the shellfish should be cooked to an internal temperature of 90 C for 90 seconds to kill pathogens.

The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

Langley’s AOK team need help repairing homes, restoring lives

An Aldergrove family will get help retrofitting their house in May, thanks to volunteers.

Fraser Health patients to see 23% hike in knee, hip replacement surgeries

New approach will see first-available surgeon waitlists

Calgary trampled Stealth at Langley Events Centre Saturday night

Pro Langley lacrosse players are off to Georgia for the last game of the season.

Kindness of Alberta students fulfills dream for older Langley couple

A new roof and fence enable a Langley City couple to stay in their home.

Lawn bowlers kick off Langley season

The bowlers welcomed new members and civic officials.

REPLAY: B.C. this week in video

In case you missed it, here’s a look at replay-worthy highlights from across the province this week

Final week for ALR input

Public consultation process closes April 30

‘When everybody leaves: Counselling key to help Humboldt move on after bus crash

Dealing with life after a tragedy can be the worst part following a loss

One person arrested after man killed in Vancouver

Police say this is Vancouver’s seventh murder of 2018

Half-naked shooter guns down four, runs away in Nashville Waffle House shooting

Nashville police say they are looking for Travis Reinking in connection with the shooting

Downtown roads closed for Vancouver Sun Run

Thousands of runners participate in the annual event

Child’s body found in river downstream from where boy went missing during flood

Three-year-old Kaden Young was swept out of his mother’s arms in February

B.C. VIEWS: Eliminating efficiency for farm workers

Don’t worry, NDP says, the B.C. economy’s booming

Hockey for Humboldt charity game Friday

Event in Maple Ridge will benefit bus tragedy victims

Most Read