Meningitis: A-to-Z Guide from Diagnosis to Treatment to Prevention

Little boy in pajamas with a thermometer in his mouth. Could it be meningitis?Introduction to meningitis:

Bacterial meningitis is one of the most dangerous infections in children. Meningitis can be swift and deadly. It can also lead to chronic disability. The fear of meningitis often haunts parents. Thankfully, most cases of bacterial meningitis can now be prevented.

What is it?

Meningitis is primarily an inflammation of the lining of the brain and spinal cord, and sometimes of the brain itself. Encephalitis is an inflammation primarily of the brain.

Most of the time, the inflammation is caused by viral infections. Most of these are usually not very serious, except in very young babies. Rarely, the inflammation is caused by fungal or parasitic infections.

Sometimes, though, meningitis is caused by a bacterial infection. Bacterial meningitis is the serious illness that people dread. Together, three types of bacteria account for over 90 percent of bacterial meningitis: H. influenza type b, meningococcus, and pneumococcus. These bacteria are transmitted by person-to-person contact through respiratory secretions. Many people carry these bacteria with no serious consequence (pneumococcus, for instance, is the most common cause of ear infections) but a few get very sick (pneumococcus causes meningitis in about 3 per 100,000 people).

In children under 2 months old, Group B strep is a common cause of bacterial meningitis.

Who gets it?

Bacterial meningitis can occur at any age, but 95 percent of cases are in children under 5 years old. Boys are more likely to get it than girls.

Babies are at the highest risk. It is also more common in children with an underlying illness, such as sickle cell anemia, cystic fibrosis, or diabetes, or in children with a weakened immune system

What are the symptoms?

Bacterial meningitis strikes in two common ways.

Sudden onset meningitis features shock, internal bleeding, purple spots, and reduced consciousness at the very outset, with a rapidly progressive course often resulting in death within 24 hours.

More commonly, meningitis begins with several days of upper respiratory symptoms or gastrointestinal symptoms. It often begins with an ear infection. Most children develop high fevers, severe headaches, and poor feeding. They may also have muscle aches, nasal congestion, vomiting, neck stiffness, and seizures. Children with meningitis become increasingly irritable and/or lethargic. The presence of petechiae and purpura (purple spots that indicate internal bleeding) is a sign that the infection may be raging out of control.

Is it contagious?

Meningitis can be quite contagious, depending on the organism causing the infection. Alert your pediatrician immediately if you think your child may have been exposed. A preventive medicine such as rifampin may be important for close contacts.

How long does it last?

For most of human history, the great majority of children with bacterial meningitis died within days. Those who survived usually had an ongoing disability, such as deafness, developmental delay, and/or seizures.

With antibiotics, the great majority of children with bacterial meningitis survive, usually without long-term complications.

Treatment usually takes one to three weeks.

How is it diagnosed?

Bacterial meningitis may be suspected based on the history, physical exam, and initial blood tests, but the diagnosis is made by a procedure called a lumbar puncture, or spinal tap. Here a small needle is placed in the fluid-filled space in the small of the back, just below the spinal cord. This fluid is tested for the presence of inflammation and for organisms.

How is it treated?

Bacterial meningitis is managed aggressively. The core treatment is intravenous antibiotics. IV fluids and other medications may be needed to reduce inflammation and prevent or treat any complications.

How can it be prevented?

Breastfeeding is somewhat protective against meningitis.

Vaccines and preventive antibiotics when exposed are two powerful methods of prevention.

When I was in my pediatrics training H. influenzae Type b (HIB) far surpassed all other causes of bacterial meningitis. In 1991, a vaccine against these bacteria was incorporated into the routine immunization schedule beginning at 2 months of age. The incidence of meningitis plummeted. Within a few years, the number of cases dropped by 95 percent in the United States as a whole, and has continued to fall.

Now a vaccine to pneumococcal bacteria is also a part of the routine schedule. In large clinical studies, the vaccine has been shown to decrease the risk of pneumococcal meningitis by more than 90 percent.

Two different meningococcal vaccines are also available, but are not routinely recommended for very young children. It is recommended, though, beginning in 2008, for all children over 11 years of age to receive a meningococcal vaccine, especially before heading off to live in any dorms or barracks. The other meningococcal vaccine is useful in young children or adults living in endemic areas, who don’t have a working spleen, or who have one of several other forms of immune deficiencies.

Whatever preventive measures you have taken, if you suspect that your child may have been exposed to meningitis, talk with your doctor about the possibility of preventive antibiotics.

Related concepts:

Spinal meningitis, Bacterial meningitis.

Dr. Alan Greene

As a father of four himself, Dr. Greene has devoted himself to freely giving real answers to parents' real questions -- from questions about those all too common childhood conditions to those that address the most recent and rare pediatric illnesses. His answers combine cutting edge science, practical wisdom, warm empathy, and a deep respect for parents, children, and the environment. He is also an electrifying public speaker, and has personally touched many during his talks in North America, Europe, Asia, and the Middle East.

Dr. Greene is a graduate of Princeton University and the University of California at San Francisco. Upon completion of his pediatric residency program at Children's Hospital Medical Center of Northern California he served as Chief Resident. He entered primary care pediatrics in January 1993.

Dr. Greene is the Past President of The Organic Center and on the Board of Directors of Healthy Child Healthy World. He is a founding partner of the Collaborative on Health and the Environment. He also consults for the Environmental Working Group.

In 1995, he launched DrGreene.com, cited by the AMA as “the pioneer physician Web site” on the Internet. His award-winning site has received over 80 million Unique Users from parents, concerned family members, students, and healthcare professionals. In addition to being the founder of DrGreene.com, he is the Medical Director for HealthTap.

In 2010 Dr. Greene founded the WhiteOut Movement to change how babies in the United States are fed. In 2012 he founded TICC TOCC - Transitioning Immediate Cord Clamping To Optimal Cord Clamping. He is also the founder of KidGlyphs, a free iPhone app that provides a tool for young children to express themselves beyond their verbal skills while teaching them important language skills.

Dr. Greene is the Founding President of the Society for Participatory Medicine and has served as both President and Board Chair of Hi-Ethics (Health Internet Ethics. He is on the Board of Directors for Healthy Child Healthy World, The Lunchbox Project, and The Society for Participatory Medicine. He has also served as an advisor to URAC for both their inaugural and their updated health web site accreditation program. He is a founding member of the e-Patient Scholars Working Group, and a founding board member of the Center for Information Therapy.

Dr. Greene is a regular columnist for Parenting Magazine. He is also the Pediatric Expert for The People’s Pharmacy (as heard on NPR) and Healing Quest (seen on PBS stations). He was the original Pediatric Expert for both Yahoo! and iVillage.

Dr. Greene is the author of Feeding Baby Green (Wiley, 2009), Raising Baby Green (Wiley, 2007), From First Kicks to First Steps (McGraw-Hill, 2004), The Parent's Complete Guide to Ear Infections (People's Medical Society, 1997), and a co-author of The A.D.A.M. Illustrated Family Health Guide (A.D.A.M., Inc., 2004). He is the medical expert for three additional books, The Parent's Soup A-to-Z Guide to Your New Baby, (Contemporary Books, 1998) The Parent's Soup A-to-Z Guide to Your Toddler, (Contemporary Books, 1999), and The Mother of All Baby Books, (Hungry Minds, Inc., 2002).

Dr. Greene is a frequent keynote speaker at important events such as Health 2.0 2011 held in San Diego, CA, IFOAM 2008 (International Federation of Organic Agriculture Movements), held in Modena Italy, the first European Internet health conference, held in Maastricht, the first International eHealth Association Conference, held in Jeddah, and the largest e-Healthcare World Conference, held in Las Vegas, and the first Green Power Baby Shower, held in Hollywood. Dr. Greene also appears frequently on TV, radio, websites, and in newspapers and magazines around the world, including such venues as the TODAY Show, Good Morning America, Fox and Friends, The Dr. Oz Show, CNN, ABC, CBS, and NBC network news, NPR, The New York Times, The Wall Street Journal, USA Today, Time Magazine, Parade, Parenting, Child, Baby Talk, Working Mother, Better Home's & Gardens, and the Reader's Digest.

Dr. Greene loves to think about challenging ideas, he enjoys being where nothing manmade can be seen, and he wears green socks.

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