There are several types of bacteria that can cause meningitis. Leading causes in the United States include
- Streptococcus pneumoniae
- Group B Streptococcus
- Neisseria meningitidis
- Haemophilus influenzae
- Listeria monocytogenes
These bacteria can also be associated with another serious illness, Sepsis is the body’s overwhelming and life-threatening response to infection that can cause tissue damage, organ failure, and death.
Causes
Common causes of bacterial meningitis vary by age group:- Newborns: Group B Streptococcus, Streptococcus pneumoniae, Listeria monocytogenes, Escherichia coli
- Babies and children: Streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae type b (Hib), group B Streptococcus
- Teens and young adults: Neisseria meningitidis, Streptococcus pneumoniae
- Older adults: Streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae type b (Hib), group B Streptococcus, Listeria monocytogenes
Risk Factors
Certain people are at increased risk for bacterial meningitis. Some risk factors include:- Age
- Babies are at increased risk for bacterial meningitis compared to people in other age groups. However, people of any age can develop bacterial meningitis. See section above for which bacteria more commonly affect which age groups.
- Community setting
- Infectious diseases tend to spread where large groups of people gather together. College campuses have reported outbreaks of meningococcal disease, caused by N. meningitidis.
- Certain medical conditions
- There are certain medical conditions, medications, and surgical procedures that put people at increased risk for meningitis.
- Working with meningitis-causing pathogens
- Microbiologists routinely exposed to meningitis-causing bacteria are at increased risk for meningitis.
- Travel