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pylori babA2 gene may be associated with increased risk of GC, especially in Asian population.Background Brain abscesses, a severe infectious disease of the CNS, are usually caused by a variety of different pathogens, which include Streptococcus intermedius (S. intermedius). Pulmonary arteriovenous fistulas (PAVFs), characterized by abnormal direct communication between pulmonary artery and vein, are a rare underlying cause of brain abscesses. Case presentation The patient was a previous healthy 55-year-old man who presented with 5 days