Disease alerts - Status Update for Haplosporidium nelsoni (MSX) - December 2025 - Status Update for Haplosporidium nelsoni (MSX) - December 2025 - Status Update for Haplosporidium nelsoni (MSX)

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Regulatory Category- Federal:

Reportable

Regulatory Category- Province or Territory:

Reportable;
Not regulated

Animal Type:

Mollusc

Susceptible Animal Types:

Mollusc

Animal Class:

Aquatic

Disease Agent:

MSX disease (Haplosporidium nelson)

Disease Agent Type:

Parasite

Organization:

Canadian Food Inspection Agency

Region:

New Brunswick;
Newfoundland and Labrador;
Nova Scotia

Event Size:

6 to 15 premises/locations

Topics:

Emerging

Start Date

Dec/31/2025

End Date

Dec/31/2025

Website

CFIA webpage

Status Update for Haplosporidium nelsoni (MSX) - December 2025

Canadian Food Inspection Agency

The Canadian Food Inspection Agency (CFIA) has confirmed the presence of Haplosporidium nelsoni (also known as multinucleate sphere unknown (MSX)) in American oysters (Crassostrea virginica) in nine locations in December 2025 - seven locations in New Brunswick, one location in Newfoundland, and one location in Nova Scotia.