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What Is Bacterial Meningitis?

Jan 13, 2022 Source: Cainiu Health
Dr. Meng Yuanyuan
Introduction
What is Bacterial Meningitis? Bacterial meningitis is a severe infectious disease of the central nervous system, commonly seen in adults and especially prevalent among children. Numerous bacterial species can cause this condition; the most common causative organism is *Neisseria meningitidis* (meningococcus), followed by *Haemophilus influenzae*, *Streptococcus pneumoniae*, *Escherichia coli*, other Gram-positive bacilli, *Staphylococcus* species, *Listeria monocytogenes*, and anaerobic bacteria.

Meningitis can be caused by numerous pathogens, including bacteria, viruses, fungi, spirochetes, and protozoa. Bacterial meningitis is a severe infectious disease associated with high mortality and significant risk of long-term sequelae. Newborns are particularly susceptible to this condition. As a parent, you should pay close attention if your child has recently been born. It is essential to learn as much as possible about the clinical manifestations of bacterial meningitis so that any abnormalities can be promptly identified and appropriately managed. So, what are the symptoms of bacterial meningitis? Let’s take a closer look below.

What Is Bacterial Meningitis?

Bacterial meningitis is a serious infection of the central nervous system, commonly seen in adults but especially prevalent among children. Many bacterial species can cause this disease; the most frequent causative agent is Neisseria meningitidis, followed by Haemophilus influenzae, Streptococcus pneumoniae, Escherichia coli, other Gram-positive bacilli, Staphylococcus spp., Listeria monocytogenes, and anaerobic bacteria.

Epidemic cerebrospinal meningitis is a purulent form of meningitis caused by Neisseria meningitidis. The pathogen initially invades the nasopharynx, enters the bloodstream to cause septicemia, and ultimately localizes to the meninges and spinal membranes, resulting in purulent inflammation. Typical clinical manifestations include fever, headache, vomiting, skin petechiae, and nuchal rigidity—signs of meningeal irritation. Cerebrospinal fluid (CSF) analysis reveals purulent changes.

Symptoms of Bacterial Meningitis

Early symptoms in infants include lethargy, fever, vomiting, refusal to feed, increased crying, and restless or disturbed sleep.

Older children may additionally present with severe headache, photophobia, phonophobia, and muscular rigidity—particularly involving the neck.

Across all age groups, progressive lethargy typically develops soon after the onset of initial symptoms; occasionally, patients may progress to coma or seizures. Some children with meningitis may also develop a characteristic rash—pink or purple, flat, non-blanching upon pressure.

The above provides an overview of bacterial meningitis. We hope this information is helpful to you.

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