Remember that outbreak of progressive inflammatory neuropathy (PIN) among pig abattoir workers back in 2007? If not, here's my blog post from January '08 summarizing the event. The good Dr. Mark Cohen(pictured at left) forwarded me a recently published article following up on the outbreak. Investigators found no infectious etiology; but they did find higher levels of interferon-gamma among PIN patients. Since elevated levels of interferon-gamma has been associated with both acute and chronic inflammatory demyelinating polyradiculoneuropathy, this finding supports an autoimmune mechanism for PIN.