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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... C22.969 Zoonoses C23 Pathological Conditions, Signs and Symptoms C23.149 Morphological and Microscopic Findings C23.149. ... 291.937 Recurrence C23.550.291.937.500 Symptom Flare Up C23.550.308 Dysbiosis C23.550. ...