Final answer:
Bacterial meningitis is caused by bacteria, specifically pathogens like Neisseria meningitidis, Streptococcus pneumoniae, and Haemophilus influenzae. It is a severe infection that can lead to serious complications and requires immediate antibiotic treatment.
Step-by-step explanation:
Bacterial meningitis is caused by a bacteria, which is a serious and life-threatening condition, typically requiring immediate treatment with antibiotics. Common bacterial pathogens that cause meningitis include Neisseria meningitidis, Streptococcus pneumoniae, and Haemophilus influenzae. These pathogens can penetrate the mucous membranes and enter the bloodstream, from where they can reach and inflame the meninges, the protective layers around the brain and spinal cord. Symptoms of bacterial meningitis include fever, neck stiffness, headaches, and sometimes more severe outcomes such as nerve damage or even death if not treated promptly.