Invasive meningococcal disease (IMD) is a serious infection caused by the bacteria, Neisseria meningitidis. Up to 10% of the population carry the bacteria at the back of their throat or nose without ever getting sick. In rare cases, IMD can cause an infection of the lining of the brain and spinal cord (meningitis) and/or an infection of the bloodstream (septicemia).
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Haemophilus Influenzae (Hi) is caused by a bacterial infection. There are many types or “strains” of it. The sickness can be mild or very serious. If the infection gets into the bloodstream, brain, or other areas where it’s usually not found, it can cause severe infection.