Why Kent meningitis outbreak that killed two students was so deadly – and how it will happen AGAIN

SCIENTISTS have uncovered why the meningitis B outbreak in Kent that killed two earlier this year was so deadly – warning it could happen all over again. The outbreak, which occurred in March 2026, was linked to a nightclub in Canterbury and saw 21 people diagnosed with invasive meningococcal disease (IMD) in one week. Students queuing to receive meningitis vaccines during the outbreak Credit: Andrew Styczynski This is a rare but serious and fast-moving bacterial infection that can cause meningitis. A mutated new strain of bacteria was understood to be behind outbreak. Sign up for the Health newsletter Thank you! Two teenagers died after contracting it and nine required intensive care. University students and young adults can be at higher risk of contracting meningitis because bacteria can spread more easily in settings such as halls of residence and parties. But clusters of cases like those reported in Kent are rare. Experts at the UK Health Security Agency (UKHSA) and the University of Oxford sought to uncover why the outbreak was so severe. After analysing the genetic code of the bugs causing the infection, they found that it borrowed small pieces of DNA from less harmful bacteria found naturally in the throats of many healthy people. These changes may have helped the bacteria camouflage itself from the immune system, allowing it to slip through defences and cause severe illness. Most read in Health A student receiving an MenB jab at the University of Kent campus in Canterbury during the outbreak Credit: PA Why is meningitis B considered the most dangerous strain? There are five main strains that cause the disease in the UK. But MenB is widely considered the most dangerous. MenB is now the most common cause of bacterial meningitis in the UK, accounting for more than 80 per cent of invasive cases. It is caused by Neisseria meningitidis group B bacteria and infects the protective membranes surrounding the brain and spinal cord, which can trigger life-threatening blood poisoning and brain inflammation. The illness often develops suddenly, and early diagnosis is critical. Dr Eliza Gil, a clinical lecturer at the London School of Hygiene & Tropical Medicine, said Neisseria meningitidis “can cause very aggressive infections”. Professor Paul Hunter, an infectious diseases expert at the University of East Anglia, added: “The most important thing any friend or parent can do is realise the person may have this infection and seek medical help. “Early treatment is vital, but diagnosis in the early hours of the illness can be very difficult. “Early symptoms can be very mild but then deterioration can be extremely rapid leading to death within a few hours. “Some of the warning signs include high fever, neck pain and stiffness, the light hurts their eyes, confusion and drowsiness and a particular skin rash that doesn’t blanch if a glass is pressed onto the skin.” According to the UKHSA, invasive bacterial strains – such as the one behind the widespread MenB outbreak – can emerge suddenly and are unpredictable. This means similar outbreaks are likely to occur again. But the very traits that made the strain so dangerous may also have worked against it, researchers also found – causing it to stop spreading. Dr Charlene Rodrigues, consultant in pathogen genomics at UKHSA, said: “This investigation shows just how quickly and dramatically these bacteria can change, sometimes acquiring new traits from harmless bacteria circulating nearby, that make them more likely to cause disease. “The fact this outbreak variant was able to spread to so many young people was due to the social environment, a place where lots of close social mixing takes place. “Through genomic surveillance and sequencing every cultured case of invasive meningococcal disease in England, we can spot when something unusual is emerging and understand what we’re dealing with in real-time. “What’s particularly interesting about this research is that it suggests the very same genetic changes that made this strain so dangerous may also explain why it hasn’t continued to spread. “But that is not something we could have predicted and these genetic events can happen again. “That unpredictability is exactly why continued surveillance and rapid response systems are so important, as are vaccination and public awareness of the signs and symptoms of meningococcal disease.” Meningitis can strike in a matter of hours, starting with vague flu-like symptoms before escalating into severe headaches, neck stiffness, light sensitivity, and sepsis. There are roughly 300 to 400 cases of meningitis diagnosed in England every year. Officials urge everyone to be alert to the signs and symptoms of meningitis, which can include a fever, headache, rapid breathing, drowsiness, shivering, vomiting and cold hands and feet. A MenB infection, one of the possible causes of meningitis, can cause inflammation of the lining of the brain and sepsis. As well as being potentially deadly, it can lead to life-changing disabilities such as amputations, hearing loss and brain damage. Following the Kent outbreak, a one-off MenB vaccination programme was launched to protect young people heading to university this autumn. In July, the Joint Committee on Vaccination and Immunisation (JCVI) also recommended that teenagers should be offered the jab on the NHS around the age of 15, with catch-up programmes for those who would otherwise miss out. The findings will be presented at the UKHSA’s annual conference in Manchester. Comment now