MSD Animal Health secures UK approval for 7-in-1 salmon vaccine as aquaculture intensifies

UK – MSD Animal Health has received marketing authorisation from the Veterinary Medicines Directorate for a new heptavalent vaccine targeting farmed Atlantic salmon, marking a significant step for disease control in an increasingly intensive aquaculture sector.

The oil-based vaccine, AQUAVAC S7, is designed to protect against a broad range of bacterial and viral diseases, including infectious pancreatic necrosis virus (IPNV), furunculosis, cold-water vibriosis, vibriosis, winter ulcer disease and yersiniosis, key threats that continue to affect salmon production across major farming regions.

The approval comes as salmon farming faces mounting biological and economic pressures. 

Disease outbreaks remain one of the leading causes of production losses globally, contributing to reduced growth rates, higher mortality and significant cost increases.

In intensive aquaculture systems, fish health is directly linked to feed performance. 

Feed typically accounts for 50–70% of total production costs, and disease challenges can significantly worsen feed conversion ratios, increasing the amount of feed required per kilogram of fish produced.

By reducing disease incidence and severity, multi-pathogen vaccines such as AQUAVAC S7 can help stabilise production cycles, improve survival rates and enhance feed efficiency, key drivers of profitability for producers.

The ability to protect against multiple pathogens in a single vaccine also reduces handling stress and operational complexity, supporting more streamlined farm management.

Industry shift toward prevention and sustainability

The development reflects a broader shift in aquaculture toward preventive health strategies, as producers and regulators move to reduce reliance on antibiotics and improve sustainability outcomes.

Major salmon-producing regions, including the UK, Norway and Chile, have faced ongoing disease challenges in recent years, prompting increased investment in vaccines, biosecurity and advanced farm management practices.

Stronger disease control also supports environmental performance. 

Healthier fish require less feed over their lifecycle and produce lower waste outputs, contributing to improved resource efficiency and reduced environmental impact.

Supporting a growing global protein market

Global demand for salmon continues to rise, driven by its role as a high-value protein source. However, supply growth is increasingly constrained by biological risks, regulatory pressures and environmental limits.

Innovations in animal health are therefore becoming central to unlocking sustainable growth. 

By improving resilience at the farm level, vaccines like AQUAVAC S7 contribute to more predictable production and help secure supply chains.

The approval of the vaccine highlights how advances in animal health, feed efficiency and production systems are becoming increasingly interconnected as aquaculture evolves to meet global protein needs.

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