Which antibodies are often associated with AMAN following Campylobacter jejuni infection?

• A. Often anti-GM1 and anti-GD1a antibodies following Campylobacter jejuni infection
• B. Anti-ACh receptor antibodies
• C. Associated with HIV infection
• D. Linked to autoimmune thyroid disease

Answer: (C)

This question hinges on the immunologic antibodies tied to AMAN after Campylobacter jejuni infection. The sequence involves molecular mimicry, where components of Campylobacter resemble nerve gangliosides, prompting an autoimmune attack on motor nerve fibers. In AMAN, the most commonly detected antibodies are anti-GM1 and anti-GD1a. Their presence supports the diagnosis by explaining the rapid, predominantly motor axonal weakness seen in this Guillain-Barré syndrome variant. Antibodies against acetylcholine receptors are characteristic of myasthenia gravis, not this post-infectious neuropathy. Associations with HIV or autoimmune thyroid disease are not the defining antibody findings for AMAN following Campylobacter infection.