Meningitis Contagious

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How is bacterial Meningitis contagious ? (Dr Ajay Kumar Lal Das)
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:
1. Streptococcus pneumoniae (50%)
2. Neisseria meningitides (25%)
3. Group B streptococci (15%)
4. Listeria monocytogenes (10%)
5. Haemophilous influenza type b (Hib) less than 10%
6. Ecoli etc
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.
Like meningococcus infection are initiated by nasopharungeal colonization, which is due to spread of infection from one person to another by sharing
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And enterobacteriacae.
Person suffering from endocarditis may develop meningitis due to HACEK Group (Haemophilus sp, Actinobacillus actinomycetemcomitans, cardiobacterium hominis, Eiknella corrodens, Kingella-kingae)
Listeria monocytogenes is an important cause of meningitis in neonates (less than 1 month in age), pregnant women and individuals of less than 60 years and immune compromised of all ages. Infection is acquired by ingesting food contaminated by listeria.
S. aureus and Coagulase negative Staphylococci are important causes of meningitis that occurs following invasive neurosurgical procedures, particularly shunting procedures for hydrocephalous or due to use of ommaya reservoirs.

Group B streptococcus or streptococcus agalaetiae was previously responsible for meningitis in neonates but now it has been reported with increasing frequency in individuals less than 50 years of age particularly those with underlying diseases.
H. influenza meningitis has been decreasing due to
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