Understanding Meningococcal Disease: A Severe Infectious Illness That Can Be Life-Threatening – Check Risk Symptoms to Watch For

"Meningococcal disease" is a severe bacterial infection transmitted through the respiratory system. Without prompt treatment, it can be fatal. Let's understand its symptoms, prevention methods, and proper vaccination guidelines to stay safe.

The term "meningococcal disease" may alarm many who wonder what it is. Thairath Online has compiled comprehensive information from Assistant Professor Dr. Rapeepan Rattanawongnara Mord, Infectious Diseases Specialist in the Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, to help the public understand and correctly recognize this disease.

What is meningococcal disease? Why does its name sound so frightening?

Meningococcal disease is caused by a Gram-negative bacterium called Neisseria meningitidis, which typically appears in pairs resembling coffee beans. The unique Thai name comes directly from the disease’s symptoms and severity as follows.

• The word "กาฬ" (pronounced 'karn') means black, reflecting the dark-colored rash that appears on patients' skin resembling a blackish hue.
• The term "หลังแอ่น" (arched back) refers to the bacteria’s ability to cause inflammation of the meninges surrounding the brain and spinal cord, leading to severe muscle spasms in the back, sometimes causing the patient's back to arch.

This bacterium spreads easily through the respiratory tract, with an incubation period of about 2-10 days after exposure. Importantly, infected individuals can transmit the bacteria via nasal mucus and saliva even if they show no symptoms or during recovery.

Check the 3 symptom groups of "meningococcal disease" that require close monitoring.

Symptoms of meningococcal disease can be classified into three main types, based on the infection site.

1. Pharyngeal inflammation symptoms

Usually an early or mild stage, where patients experience throat irritation, coughing, headaches, and sore throat.

2. Bloodstream infection

Patients develop skin rashes or small dark spots caused by bleeding. The bacteria can spread from the bloodstream to other organs such as the adrenal glands and gastrointestinal tract. Early on, symptoms may be mild, but rashes typically appear 24-48 hours after fever onset.

3. Central nervous system infection

This involves infection of the meninges and spinal cord membranes. Patients exhibit high fever, severe headache, nausea, projectile vomiting, stiff neck, and in some cases, drowsiness, confusion, numbness, or muscle weakness.

Besides sudden and chronic symptoms like intermittent joint pain lasting months, severe cases (fulminant meningococcemia) may cause circulatory failure, widespread blood vessel constriction, and rapid blood pressure drop, potentially leading to death before meningitis symptoms appear.

Treatment and prevention guidelines for the disease

Medical treatment

• If infection is suspected or confirmed, doctors administer intravenous steroids immediately, followed by antibiotics such as penicillin and then rifampicin according to medical protocols.

Prevention for close contacts and the public

• Close contacts must receive medication: individuals living in the same household, dormitories, or those exposed closely to patients' secretions should receive preventive treatment. Adults take rifampicin every 12 hours for 2 consecutive days.
• Risk behavior modification: avoid contact with others’ saliva and nasal secretions and avoid crowded places such as concerts, cinemas, or nightlife venues during outbreaks.

Who should get the meningococcal vaccine?

Vaccination is a highly effective prevention method, targeting the circulating bacterial strains (serotypes). Globally, three main vaccine types exist: MenACWY, MenB, and MenABCWY. In Thailand, MenACWY and MenB are available.

Vaccination guidelines for the general public are as follows.

MenACWY vaccine

• If the first dose is given at ages 11-12, a booster is recommended at ages 13-15.
• If the first dose is at ages 13-15, a booster is advised at ages 16-18.
• If vaccination starts at age 16 or older, no booster is necessary.

MenB vaccine

• Recommended for adolescents and young adults aged 16-23, especially those living in communal settings like university dormitories or military camps.

Additionally, high-risk groups or during outbreaks, doctors may recommend further vaccination based on risk and underlying conditions, such as pilgrims to Hajj, travelers to the "Meningitis belt" in sub-Saharan Africa, HIV patients, individuals without a spleen or with spleen dysfunction, and those with complement system deficiencies.

If you have any doubts or believe you are at risk or show symptoms, seek medical evaluation, treatment, and prevention planning immediately.