ACM - Arnold-Chiari malformation (usually just CM Chiari malformation, types 1-5)
ACTH - Adrenocorticotropic hormone
ADE - Antibody-dependent enhancement
ADH - Antidiuretic hormone, also known as vasopressin
ADP - Adenosine diphosphate
AfME - Action for ME
Ag - Antigen
ALA - Alpha-lipoic acid...