UK Health Security Agency Releases First National Health Security Risk Assessment

The UK Health Security Agency (UKHSA) has published its inaugural Health Security Risk Assessment (HSRA), identifying respiratory infections as the most significant threat to the nation’s health security over the next five years. The report, released in early 2025, establishes a formal framework for prioritizing government pandemic planning, resource allocation, and scientific surveillance based on the likelihood and potential impact of various biological and environmental hazards.

Why are respiratory infections the primary concern?

According to the UKHSA, respiratory pathogens—specifically influenza and novel coronaviruses—pose the highest risk due to their ability to spread rapidly through airborne transmission and the potential for high morbidity and mortality across all age groups. The assessment highlights that these pathogens can evolve quickly, often bypassing existing population immunity. This conclusion mirrors lessons learned from the COVID-19 pandemic and seasonal influenza surges, which demonstrate that respiratory outbreaks can overwhelm National Health Service (NHS) capacity in weeks rather than months.

What are the other top-tier health threats?

While respiratory viruses sit at the top of the risk matrix, the UKHSA identifies several other high-impact threats that require sustained monitoring. The assessment categorizes risks based on scientific modeling of current trends, including:

• Antimicrobial Resistance (AMR): The rise of “super gonorrhoea” and other resistant bacteria, which complicates routine medical procedures and infectious disease management.
• Zoonotic Diseases: Pathogens such as avian influenza (H5N1) that cross the species barrier from animals to humans, carrying the potential for sustained human-to-human transmission.
• Climate-Related Health Risks: Extreme heat events and the northward migration of disease-carrying vectors, such as ticks and mosquitoes capable of transmitting viruses like West Nile or Dengue.

How does this assessment compare to previous planning?

The 2025 HSRA marks a strategic shift from reactive crisis management to a proactive, evidence-based prioritization model. Unlike previous iterations of the National Risk Register, which often bundled health threats with broader civil contingencies, this document provides granular detail on medical countermeasures. By quantifying the probability of new pandemic-level events—estimated by the agency as having a greater than 25% chance of occurring within the next five years—the UKHSA aims to force inter-departmental cooperation on vaccine manufacturing, stockpiling of personal protective equipment (PPE), and laboratory infrastructure.

What happens next for public health policy?

The UK government intends to use the HSRA findings to align funding for the UKHSA’s “100 Days Mission,” an initiative focused on developing and deploying vaccines, therapeutics, and diagnostics within 100 days of identifying a new pathogen. Future policy will focus on “evergreen” vaccine platforms that can be rapidly adapted to new variants. For the public, this shift implies a more permanent integration of routine surveillance and early-warning systems, moving away from the stop-start funding cycles that characterized pre-2020 pandemic preparedness.

Key Takeaways

• Primary Risk: Respiratory infections are deemed the highest threat to UK stability and public health.
• Probability: There is a calculated >25% risk of a significant pandemic event occurring within the 2025–2030 window.
• Strategic Focus: The government is shifting toward rapid-response vaccine technology and enhanced surveillance for zoonotic spillover.
• Broad Threats: Climate change and antimicrobial resistance are formally codified as top-tier security risks.