Bacterial Meningitis is the most common form of suppurative CNS infection. It causes decreased consciousness, seizures, raised intracranial pressures and stroke and fever. The organism most often responsible are:
All bacterial meningitis are not contagious. But those which are contagious, the infectivity of the disease depends on the virulence of the bacteria and host immune defense mechanism.
Meningococcus Infections – Who are at Risk?
Meningococcus infections are initiated by nasopharungeal colonization, which is due to spread of infection from one person to another by sharing respiratory or throat secretions (saliva or spit) or coughing, kissing and living in close contacts. Individuals with deficiency of any complement components, including properdin are highly susceptible to meningococcal infection.
Gram Negative Infections
Gram negative bacilli causes meningitis in individuals with chronic and debilitating diseases such as diabetes, cirrhosis , or alcoholism and in those with chronic urinary tract infections. Gram negative meningitis can also complicate neurosurgical procedures, particularly craniectomy and head trauma associated with CSF rhinorrhea or otorrhoea.
Ottitis, mastoidites, sinusitis are predisposing and associated conditions for meningitis due to streptococcal species, gram negative anaerobes, staphylococcus aureus, haemophilus sp. and enterobacteriacae.
Other Types of Meningitis Infections: