Bacterial
Meningitis
What
is meningitis?
Meningitis
is an inflammation of the covering of the brain and spinal cord--also
called the meninges. It can be caused by viruses, parasites,
fungi, and bacteria. Viral (aseptic) meningitis is common;
most people recover fully. Medical management of viral meningitis
consists of supportive treatment and there is usually no indication
for the use of antibiotics. Parasitic and fungal meningitis
are very rare. Bacterial meningitis is very serious and may
involve complicated medical, surgical, pharmaceutical, and life
support management.
There
are two common types of bacteria that cause meningitis:
Strep
pneumoniae causes pneumococcal meningitis; there are over 80
subtypes that cause illness
Neisseria
meningitidis - meningococcal meningitis; there are 5 subtypes
that cause serious illness--A, B, C, Y, W-135
What
are the symptoms?
Someone
with meningitis will become very ill. The illness may develop
over one or two days, but it can also rapidly progress in a matter
of hours. Not everyone with meningitis will have the same
symptoms.
Children
(over 1 year old) and adults with meningitis may have:
Severe headache
High temperature
Vomiting
Sensitivity to bright lights
Neck stiffness, joint pains
Drowsiness or confusion
*In
both children and adults, there may be a rash of tiny, red-purple
spots or bruises caused by bleeding under the skin. These
can occur anywhere on the body. They are a sign of blood poisoning
(septicemia), which sometimes happens with meningitis, particularly
the meningococcal strain.
How
serious is bacterial meningitis?
If
it is diagnosed early and treated promptly, the majority of people
make a complete recovery. In some cases it can be fatal or
a person may be left with a permanent disability, such as deafness,
blindness, amputations or brain damage (resulting in mental retardation
or paralysis) even with prompt treatment.
How
is bacterial meningitis spread?
Fortunately,
none of the bacteria that cause meningitis are as contagious as
diseases like the common cold or the flu, and they are not spread
by casual contact or by simply breathing the air where a person
with meningitis has been. The germs live naturally in the
back of our noses and throats, but they do not live for long outside
the body. They are spread when people exchange saliva (such
as by kissing; sharing drinking containers, utensils, or cigarettes).
The
germ does not cause meningitis in most people. Instead,
most people become carriers of the germ for days, weeks or
even months. Being a carrier helps to stimulate your body's
natural defense system.
The
bacteria rarely overcomes the body's immune system and causes meningitis
or another serious illness.
What
is the risk of getting bacterial meningitis?
The
risk of getting bacterial meningitis in all age groups is about
2.4 cases per 100,000 population per year. However, the highest
risk group for the most serious form of the disease, meningococcal
meningitis, is highest among children 2 to 18 years old.
How
is bacterial meningitis diagnosed?
The
diagnosis is usually based on a combination of clinical symptoms
and laboratory results from spinal fluid and blood. Spinal
fluid is obtained by a lumbar puncture (spinal tap).
How
can bacterial meningitis be prevented?
Do
not share food, drinks, utensils, toothbrushes, or cigarettes.
Limit the number of persons you kiss.
Vaccines
against pneumococcal disease are recommended both for young children
and adults over 64. A vaccine against four meningococcal serogroups
(A, C, Y, W-135) is available. These four groups cause the
majority of meningococcal cases in the United States. This
vaccine is recommended by some groups for college students, particularly
freshmen living in dorms or residence halls. The vaccine is
safe and effective (85-90%). It can cause mild side effects,
such as redness and pain at the injection site lasting up to two
days. Immunity develops within 7 to 10 days after the vaccine
is given and lasts for up to 5 years.
What
you should do if you think you or a friend might have bacterial
meningitis?
Seek
prompt medical attention.
For
more information
Your
school nurse, family doctor, and the staff at your local or regional
health department office are excellent sources for information on
all communicable diseases. You may also call your local health
department or Regional Texas Department of Health office to ask
about meningococcal vaccine. Additional information may also
be found at the web sites for the Centers for Disease Control and
Prevention: www.cdc.gov and the
Texas Department of Health: www.tdh.state.tx.us.
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