Chronic gastritis is caused by all except

Overuse of salicylates (NSAIDs) cause acute gastritis Gastritis Gastritis is the inflammation of Gastric mucosa. It is a histological diagnosis and can be divided into - A. Acute gastritis It is acute mucosal injury, usually transient in injury and is associated with neutrophilic infiltration. Important causes are Heavy use of NSAIDs (aspirin)    Alcohol and smoking    Uremia          Ischemia and shock Severe stress (Trauma, burn, surgery) Nasogastric intubation B. Chronic gastritis It is characterized by the presence of chronic mucosal inflammatory changes leading eventually to mucosal atrophy and intestinal metaplasia, usually in the absence of erosions. Important causes are H.pylori infection  Alcohol and smoking          Radiation  Autoimmune, in association with pernicious anemia Granulomatous conditions → Crohn disease Miscellaneous - Amyloidosis, graft - versus - host disease, uremia.