Definition: Antitheumatism refers to a condition in which an immune system mistakenly attacks and damages healthy cells, sometimes leading to severe inflammation that can result in the death or destruction of tissue without causing an obvious infection or illness. Antitheumatism can be caused by various factors, including infections such as tuberculosis (TB), parasites likeι©η«―θΊζδ½η (Feline Leukemia Virus (FLUV)), and viral infections like cytomegalovirus (CMV).