There are many different strains of meningitis in the UK and many different causes for these, most commonly viruses and bacteria.
This type of bacterial meningitis mainly occurs in babies and young children under 18 months of age. The elderly and people with conditions that affect their immune systems are also at increased risk.
Group B streptococcal bacteria can cause meningitis and septicaemia in young babies. Up to 50% of babies may be left with after-effects.
Caused by the bacterium Mycobacterium tuberculosis, infection usually begins elsewhere in the body, usually the lungs. Unlike other types of bacterial meningitis, TB meningitis usually develops slowly with vague symptoms.
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