In its latest government update, the UK Health Security Agency said the self-isolation period for UK contacts of confirmed Andes hantavirus cases linked to the MV Hondius outbreak has been reduced from 45 days to 42 days. UKHSA said the revision followed a review of the evidence on the outbreak strain and now brings UK practice into line with World Health Organization guidance. According to UKHSA, people already isolating in the UK have been informed of the shorter period. The agency also made clear that the original 45-day requirement was an early precaution, adopted before fuller epidemiological information on the strain was available.
That change closes a distinct phase in a response built around cautious containment, managed repatriation and daily monitoring. From the first UK statements on 6 May, UKHSA, the Department of Health and Social Care and the Foreign, Commonwealth and Development Office repeatedly said the risk to the wider public was very low, even as tracing and isolation arrangements were widened. The incident centred on Andes hantavirus cases associated with the expedition vessel MV Hondius. UKHSA’s updates show why the response was initially set at a high level of precaution: possible contacts were spread across the UK, overseas territories and other countries, while the evidence base on the outbreak strain was still being assessed by WHO and national authorities.
Between 8 and 10 May, the government moved from contingency planning to active repatriation. The FCDO chartered a dedicated flight from Tenerife for British passengers and crew who were not showing symptoms, while UKHSA and NHS infectious disease specialists supervised infection prevention and control measures during travel and on arrival. UKHSA said 20 British nationals, one German national resident in the UK and one Japanese passenger were transferred to Arrowe Park Hospital on the Wirral for an initial 72-hour assessment period. From there, clinicians and public health teams determined whether individuals could complete isolation at home or in other suitable accommodation, with daily contact and testing arrangements maintained throughout.
As the response progressed, the operating model became more tailored. From 12 May onwards, UKHSA began moving some contacts out of Arrowe Park after individual clinical and public health assessments, allowing them to finish isolation at home or in alternative settings with public health protections in place. Government updates on 13, 14, 22 and 26 May show a steady increase in those transferred out of the facility. On 13 May, UKHSA reported that all contacts still at Arrowe Park were asymptomatic and that testing of contacts had been negative. By late May, 16 people had left Arrowe Park to continue isolation elsewhere, while monitoring and welfare support continued across the UK.
A parallel strand of the response involved British contacts in St Helena and Ascension Island. UKHSA, the FCDO, DHSC and NHS teams arranged for asymptomatic contacts to travel to the UK as a precaution so they could complete isolation with access to England’s high consequence infectious disease network if required. The same approach shaped the handling of a medic on Ascension Island who developed symptoms. UKHSA said the person’s earlier samples had tested negative, but the absence of a specialist infectious diseases unit on the island meant medical evacuation to the HCID unit at Guy’s and St Thomas’ NHS Foundation Trust was judged appropriate as a precaution. A separate British national who had already been confirmed as a case and treated in the Netherlands was later returned to England with strict infection prevention and control measures in place.
The government’s own chronology also shows how much of the response depended on international coordination rather than domestic arrangements alone. WHO led the wider outbreak response, while UKHSA said it worked with Dutch authorities, Spanish officials, Cape Verde, UK overseas territories and the cruise operator at different points in the incident. On 15 May, UKHSA and the UK Public Health Rapid Support Team deployed a rapid response mobile laboratory to St Helena at the request of the territory’s government. The team, delivered through the UKHSA and London School of Hygiene & Tropical Medicine partnership funded by DHSC, brought PCR testing capacity and infection prevention expertise to Jamestown General Hospital. On 18 May, DHSC said Japan’s Ministry of Health, Labour and Welfare had supplied favipiravir to strengthen UK treatment stocks in case further cases were confirmed.
Early public communication was marked by careful distinction between confirmed cases, suspected cases and contacts. On 9 May, government departments said WHO had identified eight cases connected to the outbreak, including three British nationals, before later updates clarified when suspected cases had been discounted or when existing cases were being added to UK statistical reporting after transfer back to England. From an administrative perspective, that distinction matters because cross-border outbreak figures can change when patients move between jurisdictions, not only when transmission changes. UKHSA made that point directly on 26 May, when it said the British national returning from the Netherlands was not a new case but an existing one previously confirmed by WHO on 7 May.
Taken together, the UKHSA updates describe a response that began with maximum precaution and then narrowed as evidence improved. The reduction from 45 days to 42 days is the clearest example: the agency first used a longer isolation period while the outbreak strain was being assessed, then adopted the WHO standard once the epidemiology was clearer. For affected passengers, crew and close contacts, the immediate effect is practical rather than symbolic: a slightly shorter isolation period, wider use of supported home isolation where clinically safe, and continued access to NHS and local authority support. For the public, the core government message has remained unchanged throughout the sequence of updates: the risk of wider transmission in the UK remains very low.