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Study finds only half of infants with deadly meningitis show traditional signs of the disease

Study finds only half of infants with deadly meningitis show traditional signs of the disease

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Credit: St. George’s University of London

Researchers at St George’s, University of London, say their new study shows the classic symptoms associated with bacterial meningitis are uncommon in young infants less than three months of age – the group at highest risk of the disease.

Only around half of babies under three months of age who have bacterial meningitis display fever, which has for decades been the trigger for further medical investigations.

Professor Paul Heath, one of the study investigators at St George’s, University of London, said: “The classic features of meningitis were uncommon in many cases. The symptoms displayed by young infants when they are seen by doctors at first in hospital are often non-specific and only half of cases showed signs of a fever.

“Guidelines focusing on serious infections—including meningitis—in children have been introduced in the UK and the USA but all specify fever as a key feature of infection.

“Unfortunately, neither the rates of bacterial meningitis in babies, nor the numbers of deaths, has changed since the 1980s.

“Clinicians must, therefore, still consider bacterial meningitis in the diagnosis of an unwell infant that doesn’t present with fever.”

The study, titled “Clinical Characteristics and Risk Factors for Poor Outcome in Infants Less Than 90 Days of Age with Bacterial Meningitis in the United Kingdom and Ireland,” is published in the Paediatric Infectious Diseases journal.

The study led by experts at St George’s University of London, funded by charity Meningitis Research Foundation (MRF), involved 263 infants across the UK and Ireland and found that fever (temperature above 38oC) was reported in only 54 percent of cases, seizures in 28 percent, bulging fontanelle in 22 percent, coma in 6 percent and neck stiffness in only 3 percent.

In the UK, babies under three months of age are 70 times more likely to get bacterial meningitis than adults. Newborn babies are at the highest risk of all.

The study found that infants who did present with fever tended to be older than infants without fever. The median age for this symptom was around 21 days old. Of note, 52 percent of the infants without fever had other features suggestive of bacterial meningitis, such as apnea (33 percent), seizures (32 percent), bulging fontanelle (16 percent), coma (7 percent) and neck stiffness (3 percent).

Earlier research from the same experts found there to be in the region of 350 cases of bacterial meningitis in infants under three months of age per year in the UK and Ireland. Group B streptococci (GBS) and Escherichia coli remain the main causes of bacterial meningitis in this age group.

The study suggests that there should be a low threshold for performing investigations on young infants when they arrive at hospital. Common features were found to be poor feeding, lethargy and irritability, all of which can be difficult to distinguish from mild illness.

Vinny Smith, Chief Executive at MRF, said: “Young babies are particularly vulnerable to bacterial meningitis. Meningitis and septicaemia are deadly diseases that strike without warning. One in ten people affected will die and a third of survivors will be left with after-effects, some as serious as brain damage, amputations, blindness or hearing loss.

“Based on this research, we have collaborated with the study investigators to create a training package aimed at doctors and health professionals to aid rapid diagnosis and clinical management.

“The package includes an eTool to help clinicians recognise clinical features of bacterial meningitis in young infants; a lumbar puncture information sheet to help doctors explain this procedure to parents; and an algorithm to aid management of bacterial meningitis. We hope that it can ultimately improve outcomes for this vulnerable age group. We have also updated our symptoms information for parents so that they know not to rely on fever alone as the main symptom to look out for in babies.”

MRF’s teaching package including the eTool can be accessed here and ‘Babywatch’ card for parents is here.

Infants with bacterial meningitis in the UK and Ireland were identified through the British Paediatric Surveillance Unit, laboratory surveillance and meningitis charities.


Explore further:
Poor treatment of meningitis in kids can lead to tragedies warn experts

More information:
Ifeanyichukwu O. Okike et al. Clinical Characteristics and Risk Factors for Poor Outcome in Infants Less Than 90 Days of Age with Bacterial Meningitis in the United Kingdom and Ireland, The Pediatric Infectious Disease Journal (2018). DOI: 10.1097/INF.0000000000001917

Journal reference:
Pediatric Infectious Disease Journal

Provided by:
St. George’s University of London

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