Understanding meningitis in babies: causes, symptoms and treatments

Meningitis is an inflammation of the meninges, the thin membranes that surround the brain and spinal cord. This illness can be very serious, especially in newborns and young children. In this article, we discuss the causes of meningitis in babies, the signs to watch out for, and the treatment options available.

Causes of meningitis in babies

Meningitis can be caused by different types of infectious agents: bacteria, viruses or fungi. Here is an overview of the various possible causes:

Bacterial meningitis: this is the most dangerous form of meningitis, as it can lead to serious and potentially life-threatening complications. The main bacteria responsible are pneumococcus (Streptococcus pneumoniae), meningococcus (Neisseria meningitidis) and Haemophilus influenzae type b (Hib). Vaccines are available to protect against these bacteria.

Viral meningitis: this form of meningitis is generally less severe than bacterial meningitis and often resolves without specific treatment. The main culprit is the enteric virus (coxsackievirus), but other viruses such as the chickenpox virus can also cause cases of viral meningitis.

Fungal meningitis: this type of meningitis is very rare in babies. It generally occurs in individuals whose immune system is weakened, such as those with HIV/AIDS or who have undergone an organ transplant.

Symptoms of meningitis in babies

The symptoms of meningitis can vary depending on the baby's age and the cause of the infection. Some signs are common to several types of meningitis, whilst others are specific to a particular infectious agent. Here are some possible symptoms:

General symptoms

High fever

Irritability, unusual crying

Loss of appetite, difficulty feeding

Excessive drowsiness or difficulty waking

Neck stiffness (difficulty bending the neck forward)

Vomiting and diarrhoea

Body stiffness or seizures

Symptoms specific to newborns

A bulging fontanelle (the soft spot on top of the head)

A pale or bluish complexion

Rapid or laboured breathing

Abnormal reactions to light or noise

Note that some symptoms may be absent in babies, such as neck stiffness or seizures. Early diagnosis and treatment are essential to avoid potentially serious complications. If you suspect your child has meningitis, seek medical attention immediately.

Diagnosis of meningitis in babies

The doctor will first carry out a physical examination and ask questions about the child's medical history and observed signs. To confirm the diagnosis of meningitis and determine its cause, further tests will likely be necessary:

Lumbar puncture: this examination involves taking a sample of cerebrospinal fluid (CSF) using a needle inserted into the space between the vertebrae in the lower back. The CSF is then analysed to detect the presence of infectious agents and/or abnormalities linked to inflammation of the meninges.

Blood test: a blood sample may be taken to measure the blood count, check electrolyte levels or look for bacteria.

Medical imaging: an ultrasound scan, chest X-ray or CT scan may be carried out to look for possible complications of meningitis, such as a cerebral abscess or signs of pulmonary involvement.

Treatment of meningitis in babies

The treatment of meningitis depends on the underlying cause. Treatment options vary according to the type of meningitis:

Bacterial meningitis: antibiotic treatment is essential to fight the infection and prevent its complications. Antibiotics are generally administered intravenously (IV) in hospital. The duration of treatment can vary between 7 and 21 days, depending on the severity of the infection.

Viral meningitis: in the majority of cases, no specific treatment is necessary and the infection resolves on its own. The doctor may prescribe painkillers and antipyretics (to reduce fever) to relieve symptoms. The child should rest and drink plenty of fluids to stay hydrated.

Fungal meningitis: fungal infections generally require treatment with antifungal medicines, administered orally or IV. These medications help to destroy the fungi responsible for the infection and prevent their recurrence.

It is crucial to follow the doctor's instructions and complete the prescribed course of treatment. Stopping an antibiotic or antifungal treatment early can lead to the infection returning, or even make it more difficult to treat subsequently.

Prevention of meningitis in babies

The best way to protect your child against certain forms of meningitis is vaccination. The recommended vaccination schedule includes vaccines against:

Pneumococcus (PCV13)

Haemophilus influenzae type b (Hib)

Meningococcus (MenACWY or MenB, depending on local recommendations)

Other preventive measures include regular handwashing and following good hygiene practices to prevent the spread of germs. This is particularly important when there are other unwell children in your baby's immediate environment.

Finally, be attentive to the signs and symptoms of meningitis in your child. If you suspect an infection, do not hesitate to consult a healthcare professional promptly.