In neonates - Gram -ve bacilli, e.g. E. coli, Klebsiella.
Haemophilus influenzae. In children - Haemophilus influenzae. Pneumococcus (Strep, pneumoniae).
Meningococcus. (Neisseria meningitidis). In adults - Pneumococcus. Meningococcus.
Infections of mixed aetiology (two or more bacteria) may occur following head injury, mastoiditis or iatrogenically after lumbar puncture.
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Alcoholism is something that can't be formed in easy terms. Alcoholism as a whole refers to the circumstance whereby there's an obsession in man to keep ingesting beverages with alcohol content which is injurious to health. The circumstance of alcoholism doesn't let the person addicted have any command over ingestion despite being cognizant of the damaging consequences ensuing from it.