A measles outbreak in north London is rapidly shifting from a public health concern to a live liability issue for employers, councils and their insurers.
At least 34 children in Enfield have contracted measles so far this year, with some requiring hospital treatment. Local health leaders have described the spike as significantly higher than typically seen in the area. In response, Enfield Council has warned that unvaccinated pupils identified as close contacts could be excluded from school for 21 days under national guidance.
The outbreak comes amid sharply declining MMR uptake. Just 64.3% of five-year-olds in Enfield received both doses in 2024/25 - far below the 95% threshold generally required to prevent outbreaks and materially lower than the national average of 84.4%.
For insurers, the relevance is immediate. Once an outbreak is publicly confirmed, the question moves from epidemiology to exposure.
David Tait, partner at Clyde & Co, said the legal framework will turn on foreseeability and causation.
“From an employers’ liability standpoint, the key issues are foreseeability and causation. Once an outbreak is publicly confirmed, employers are on notice that measles presents a credible workplace risk, particularly in public facing roles,” he said.
“Following COVID-19, duty holders’ awareness of transmissible disease risks is significantly heightened, and unlike COVID-19, measles is not a novel disease. Courts are therefore likely to expect employers to understand the risk and to have appropriate control measures in place.”
If an employee contracts measles and alleges inadequate infection control, insurers may see claims framed around breach of the duty to provide a safe working environment.
“However, causation remains the main hurdle: proving that exposure occurred at work rather than in the community will be extremely difficult,” Tait said.
That evidential barrier may limit successful claims, but it does not remove the scrutiny. Employers can expect close examination of outbreak risk assessments, hygiene protocols and staff communications.
The outbreak also sharpens obligations toward clinically vulnerable workers, pregnant employees and those unable to be vaccinated.
“Employers have heightened obligations toward clinically vulnerable staff, pregnant employees, and those medically unable to be vaccinated,” Tait said.
“Under health and safety law and the Equality Act, employers must consider reasonable adjustments such as temporary redeployment, remote working, or enhanced protective measures. Failure to tailor responses to individual risk profiles could expose employers to discrimination or personal injury claims.”
For brokers, this raises practical questions around how far adjustments must extend, and how well those decisions are documented.
For local authorities such as Enfield, the exposure cuts across employer and public liability lines.
“For local authorities, outbreaks cut across both employer and public liability exposures,” Tait said. “Councils must be able to demonstrate that their response, across schools, social care settings and public facilities, is robust, well documented and aligned with current public health guidance.”
Insurers, he added, will expect evidence of lawful vaccination status monitoring, rapid incident reporting and consistent infection control measures.
“Post COVID, many public liability policies now contain communicable disease exclusions, meaning some outbreak related claims may fall outside cover.”
Beyond coverage, councils also face potential regulatory scrutiny.
“In this environment, risk management frameworks must be both agile and defensible,” Tait said, pointing to the risk of investigation under health and safety legislation if controls are found wanting.
If outbreaks in schools and nurseries become more frequent, the insurance response may extend beyond individual claims.
“If measles outbreaks become more common in schools and early years settings, insurers are likely to reassess both pricing and coverage terms for the education sector,” Tait said.
“Although [these] will not apply to employers’ liability cover, we may see greater reliance on communicable disease exclusions within public liability policies alongside higher deductibles and more probing underwriting around vaccination policies, staff training and outbreak response planning.”
A sustained pattern of outbreaks could narrow capacity.
“Over time, insurers are likely to differentiate more sharply between institutions with strong immunisation and risk management cultures and those with weaker controls.”
Local clinicians have reported that all confirmed cases in the borough have been among unvaccinated children, with a notable proportion requiring hospital care. For insurers, that data is not just clinical, it is actuarial.
Declining vaccination rates alter baseline assumptions about communicable disease risk in education and other public-facing environments. In a market where communicable disease exclusions have become more prevalent post-pandemic, repeated outbreaks could reintroduce pricing tension and stricter underwriting scrutiny in affected sectors.
For now, the immediate focus remains containment. But if London’s outbreak proves to be more than an isolated pocket, communicable disease risk may quietly move back up the liability underwriting agenda.
