Public health officials have released the latest weekly breakdown of infectious agents detected in laboratories across England, as health authorities continue to monitor the impact of expanded reporting requirements introduced last year.
The UK Health Security Agency (UKHSA) published its Week 36 causative agents report on 7 September 2026, covering laboratory notifications for the seven days ending 6 September 2026. The data includes reports on a wide range of pathogens, including Campylobacter, Salmonella, and Legionella.
Under statutory duties, both registered medical practitioners and diagnostic laboratories are required to notify the UKHSA of specific diseases and causative organisms. These reports serve as an early warning system to detect outbreaks and monitor national health trends.
Expanded Monitoring Requirements
The latest data reflects significant changes to the surveillance system that came into effect on 6 April 2025. Following an amendment to the Health Protection (Notification) Regulations, the list of organisms that laboratories must legally report was expanded to provide a clearer picture of public health threats.
New pathogens added to the statutory list since 2025 include norovirus, respiratory syncytial virus (RSV), and tick-borne encephalitis virus (TBEV). These additions allow health officials to track the seasonal spread of winter bugs and emerging environmental risks more accurately.
A notable addition to the list of notifiable diseases for medical practitioners is chickenpox (varicella). This change was implemented to help the UKHSA monitor the effectiveness of the national vaccination programme, which was launched in early 2026. By tracking cases of chickenpox, officials can assess how well the vaccine is performing across different age groups and regions.
Understanding the Data
Health officials have reminded the public that these weekly reports consist of raw laboratory results rather than final clinical diagnoses. Because they are based on detections before standardised case definitions are applied, they reflect general trends rather than a confirmed total of every individual case.
There remains a distinct difference between “notifiable diseases” and “causative agents” in the reporting system:
- Notifiable Diseases: These are reported by doctors when they suspect a patient has a specific condition, such as measles, scarlet fever, or whooping cough.
- Causative Agents: These are reported by laboratories when they identify the specific bacteria, virus, or parasite causing an infection.
For certain “urgent” diseases, such as botulism, meningitis, or anthrax, medical practitioners are required to notify local health protection teams within 24 hours of suspicion to ensure immediate public health action can be taken.
While the reporting list was expanded in 2025, the UKHSA noted that data for some of the newly added agents is still undergoing development work to ensure full accuracy in weekly publications. Members of the public seeking advice on common conditions like food poisoning or respiratory infections can find guidance via the NHS website or by calling 111.