UKHSA sharpens outbreak control for suspected infectious diarrhoea in adult social care
New onset diarrhoea and vomiting in adult social care settings should be handled as infectious until there is good evidence to think otherwise. In practice, that means the first few hours matter: prompt recognition, immediate reporting, and strict infection control can determine whether a single symptomatic person remains an isolated case or whether the illness spreads through a care home, supported living service, or domiciliary care network.
The updated guidance places diarrhoea and vomiting firmly in the realm of infection prevention and control rather than routine symptom management. It applies across adult social care settings, including care homes for older adults, homes for younger adults with learning disabilities, day centres, extra care services, supported living, and home care. The central message is straightforward and operational: if a person develops symptoms and the cause is not yet clear, assume infection, act quickly, and use a structured approach while the cause is being identified.
Why new symptoms are treated as infectious first
The clinical logic is rooted in transmission dynamics. Many causes of diarrhoea and vomiting spread through the faecal-oral route, and several pathogens survive on contaminated hands, surfaces, food, equipment, and in some cases water. Norovirus, rotavirus, Clostridioides difficile, Salmonella, and Cryptosporidium are among the examples named in the guidance. In communal care settings, those organisms can move quickly when a symptomatic person shares bathrooms, dining areas, touchpoints, or caregiving staff.
Diarrhoea is defined as three or more loose stools in 24 hours, and the guidance also points staff to the Bristol stool chart when interpretation is uncertain. Vomiting, stomach cramps, fever, nausea, and signs of dehydration such as dry mouth or reduced urine output all strengthen the need for a rapid assessment. A single loose stool may not meet the definition, but the broader clinical picture still matters, particularly when the person is frail, immunocompromised, or already medically complex.
Staff are instructed to complete a risk assessment as soon as symptoms appear. The checklist is practical and clinically relevant: possible food exposure, close contact with someone with similar illness, underlying conditions, recent gastrointestinal procedures, a nasogastric tube, laxative use, and recent antibiotics. Each of these can change the differential diagnosis, the likelihood of infection, and the degree of escalation needed.
A sudden cluster of vomiting or diarrhoea in one unit can be the first sign of an outbreak, not an isolated upset stomach.
SIGHT turns infection control into a bedside routine
The guidance uses the SIGHT approach to help staff remember the sequence of actions: Suspect, Individual, Gloves, Hand hygiene, Test. It is designed to compress infection control into a routine that can be applied at the point of care, where delays often drive spread.
Under the “Suspect” step, staff should treat diarrhoea or vomiting as potentially infectious when there is no clear non-infectious explanation. Under “Individual,” the symptomatic person should be kept away from others while symptomatic and until they have been free of symptoms for 48 hours. That isolation period is not arbitrary; it reflects the prolonged infectivity seen with several gastrointestinal pathogens, especially in settings with shared facilities and close personal care.
The same logic applies to food handling. Symptomatic individuals should not prepare food or drinks until they are fully recovered, because even brief contamination events can seed outbreaks through meals, drinks, utensils, or shared preparation areas. For staff, the instruction is equally firm: do not work while unwell, and return only after 48 hours symptom-free. In care settings where one staff member may support multiple residents, attendance while symptomatic can turn a single case into a staffing and infection-control problem at once.
Gloves and hand hygiene remain foundational, but the guidance does not treat them as standalone measures. They sit alongside environmental cleaning, prompt testing when appropriate, and rapid communication. Hand hygiene is especially important after contact with body fluids, contaminated surfaces, or soiled items, and after glove removal. Gloves reduce direct contamination, but they do not replace cleaning or handwashing.
Reporting, escalation, and outbreak recognition
The guidance pushes early escalation. Managers or nominated deputies should be informed straight away when symptoms emerge, and the usual local reporting pathway should be followed. In domiciliary care, where residents are seen in separate homes and outbreak patterns can be less visible, providers are told to rely on visit logs, staff sickness records, and symptom reports to spot linked cases early.
Escalation to healthcare professionals is recommended when clinical advice is needed, when the person requires medical care, or when the condition is worsening. If ambulance staff attend, details of the diarrhoea or vomiting should be shared so that appropriate IPC precautions are used from the start. That exchange of information matters because transport, handover, and emergency assessment can all be points of secondary exposure if the infectious risk is not made explicit.
An outbreak is defined as two or more confirmed or suspected linked cases in time or place with a common exposure. The guidance includes staff, visitors, and people receiving care in that definition. Once an outbreak is suspected or confirmed, it should be reported to the care setting’s UKHSA local health protection team, local authorities, and local IPC teams according to local arrangements. UKHSA’s local health protection teams are positioned to support control measures and coordinate public health advice with other agencies where needed.
Capacity, dignity, and proportionate information sharing
Alongside infection control, the guidance places clear weight on the Mental Capacity Act 2005. Staff must presume capacity unless it has been assessed otherwise, support understanding in a way the person can manage, and document any capacity assessment clearly. If capacity is lacking, decisions or protective measures must be taken in the person’s best interests and be proportionate, necessary, and least restrictive.
That legal frame is not separate from infection control; it is part of it. Isolation, restricted movement, and temporary separation from communal spaces can affect autonomy and distress, especially in adult social care where people may already experience dependency or cognitive impairment. The guidance calls for compassionate but proportionate information sharing, which is particularly relevant when symptoms create anxiety among other residents, families, or staff.
After recovery, the instructions do not end with symptom resolution. Deep cleaning is required, and care teams should review what happened, how early signs were detected, and whether any process gaps allowed spread. In that sense, the guidance is less about a single infection episode than about building a system that detects gastrointestinal illness early, interrupts transmission quickly, and preserves safety without stripping away dignity.