How common is gullian barre ?

Not rare: An acute autoimmune polyneuritis, often subsequent to influenza A infection, but may be associated with other post-infectious problems such as Campylobacter jejuni, EBV, mycoplasma infections, and even occurs with "tick paralysis". Usually self limited, but rarely becomes chronic in form of CIDP. Exact statistics not fully clear but not an uncommon outcome of some common infections.