bacteria infecting neurons

neuron neuronal brain bacteria cell encephalitis meningitis bacterial infection 3d illustration virus microbe microorganism central nervous system inflammation medicine medical neisseria meningitidis meningococcus meningococci headache fever human listeria monocytogenes haemophilus influenzae streptococcus pneumoniae pneumococcus listeriosis diplococcus diplococci pneumococci porphyromonas gingivalis alzheimers disease tissue contamination