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Brain abscess
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=== Other organisms === [[fungus|Fungi]] and [[parasite]]s may also cause the disease. Fungi and parasites are especially associated with immunocompromised patients. Other causes include: ''[[Nocardia asteroides]]'', ''Mycobacterium'', Fungi (e.g. ''[[Aspergillus]]'', ''[[Candida (fungus)|Candida]]'', ''[[Cryptococcus (fungus)|Cryptococcus]]'', ''Mucorales'', ''Coccidioides'', ''[[Histoplasma capsulatum]]'', ''[[Blastomyces dermatitidis]]'', ''Bipolaris'', ''[[Exophiala dermatitidis]]'', ''[[Curvularia pallescens]]'', ''Ochroconis gallopava'', ''Ramichloridium mackenziei'', ''[[Pseudallescheria boydii]]''), Protozoa (e.g. ''[[Toxoplasma gondii]]'', ''[[Entamoeba histolytica]]'', ''[[Trypanosoma cruzi]]'', ''[[Schistosoma]]'', ''Paragonimus''), and Helminths (e.g. ''Taenia solium''). Organisms that are most frequently associated with brain abscess in patients with [[AIDS]] are [[poliovirus]], ''Toxoplasma gondii'', and ''[[Cryptococcus neoformans]]'', though in infection with the latter organism, symptoms of [[meningitis]] generally predominate.{{cn|date=June 2022}} These organisms are associated with certain predisposing conditions:{{cn|date=May 2024}} * Sinus and dental infectionsāAerobic and anaerobic streptococci, anaerobic gram-negative bacilli (e.g. ''Prevotella'', ''Porphyromonas'', ''Bacteroides''), ''Fusobacterium'', ''S. aureus'', and Enterobacteriaceae * Penetrating traumaā''S. aureus'', aerobic streptococci, Enterobacteriaceae, and ''Clostridium'' spp. * Pulmonary infectionsāAerobic and anaerobic streptococci, anaerobic gram-negative bacilli (e.g. ''Prevotella'', ''Porphyromonas'', ''Bacteroides''), ''Fusobacterium'', ''Actinomyces'', and ''Nocardia'' * Congenital heart diseaseāAerobic and microaerophilic streptococci, and ''S. aureus'' * HIV infectionā''T. gondii'', ''Mycobacterium'', ''Nocardia'', ''Cryptococcus'', and ''Listeria monocytogenes'' * Transplantationā''Aspergillus'', ''Candida'', ''Cryptococcus'', ''Mucorales'', ''Nocardia'', and ''T. gondii'' * NeutropeniaāAerobic gram-negative bacilli, ''Aspergillus'', ''Candida'', and ''Mucorales''
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