Why does meningitis require such urgent action?
Invasive Meningococcal Disease is considered a medical emergency because of how severe and fast-moving it can be. According to the European Centre for Disease Prevention and Control (ECDC), it most commonly presents as meningitis or sepsis, both of which can lead to serious complications.
Meningitis typically causes symptoms such as fever, headache and neck stiffness. In more severe cases, the infection can enter the bloodstream, leading to meningococcal sepsis, which may result in septic shock, organ failure and, in some cases, death.
Data from the ECDC shows that overall fatality rates range between 8% and 15%, but the risk is significantly higher in severe cases. Meningococcal sepsis, for example, can have a fatality rate of up to 40%. Even among those who survive, up to 20% may experience long-term effects such as neurological damage, hearing loss or amputation.
According to the Centers for Disease Control and Prevention (CDC), early symptoms often resemble those of more common illnesses, which can make diagnosis difficult. This combination of rapid progression and difficult early detection is one of the main reasons why health authorities respond so quickly to suspected outbreaks.
What has caused this unusually large outbreak remains unclear, but experts point to several possible explanations.
“This is the most fascinating question that has arisen from this outbreak,” says Emma Wall, a clinical professor at Queen Mary University of London, in research published in the BMJ. While MenB has caused outbreaks in the UK before, these have typically involved only small numbers or developed over longer periods.
Wall suggests that the scale of the outbreak may be linked either to the initial transmission event, such as a crowded social setting, or potentially to changes in the bacteria itself, although this is still under investigation.
Why can MenB spread so quickly, especially among university students?
It is usually passed on by people who carry the bacteria (Neisseria meningitidis) in their nose or throat. According to the ECDC, around 1 in 10 people carry the bacteria without symptoms, a situation known as asymptomatic carriage.
Transmission of MenB occurs through secretions from the mouth or airway and typically requires close and prolonged contact, such as living in the same household or intimate contact like kissing or sharing drinks or vapes, Eliza Gil, a clinical lecturer at the London School of Hygiene & Tropical Medicine, explains.
As a result, outbreaks, although rare, are more likely to occur in settings where people group together, such as college campuses or military recruits, according to both the ECDC and the UK Health Security Agency (UKHSA).
Why are antibiotics used preventively in meningitis outbreaks?
As stated on Gov.gg, the official website for the States of Guernsey, A single course of antibiotics is highly effective in preventing the contraction and spread of this disease in 90% of cases. Preventative antibiotics (also called prophylaxis) play a crucial role in the response by limiting further spread and treating people who have already become ill.
Antibiotics are not being offered to all students at this stage. The outbreak response is focused on close contacts of confirmed or suspected cases, as well as people who have been in high-risk settings such as universities, colleges and social venues linked to the outbreak.
In these cases, a single dose or short course of antibiotics is used, as this approach has been proven to be safe and highly effective in previous clinical trials.
According to Dr. Robert Brunham, the head of the UBCCDC Vaccine Research Laboratory at BCCDC and a professor emeritus of medicine at UBC, “Invasive meningococcal disease can be prevented by vaccines, but not all strains of the organism have vaccines and vaccines may not be routinely used on all populations. If a meningococcal outbreak is occurring for a strain that has a vaccine, then vaccination in addition to antibiotics is used for prevention.”
“Any use of an antibiotic creates concern for promoting the development and spread of antibiotic resistance. Because prevention courses of antibiotics are strictly limited in time, that is as a single dose or short course, antibiotic resistance has not emerged as major problem,” Dr. Brunham states.
How do health authorities identify and contact people who may be at risk?
The UKSHA is responding to the outbreak by implementing measures to prevent further transmission, including contact tracing. This involves identifying individuals who have been in contact with an infected person, informing them of their risk, and following up to monitor symptoms and possible infection.
In the Kent outbreak, the UKHSA is leading this response, while the ECDC continues to monitor the situation through surveillance and coordination with the relevant partners.