Abstract: A novel substitution at the receptor-binding site (Tyr 137 to Phe) was reported to be found exclusively in influenza type A (H3N2) viruses isolated from patients with influenza encephalopathy, suggesting that encephalopathy may be caused by a variant influenza type A (H3N2) virus.
IV mutation literature information.
PMID: 
2000
Pediatrics international
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