and evolved there into five different genotypes which spread across Asia. The mean evolutionary rate has been estimated to be 4.35 (range: 3.49 to 5.30) nucleotide substitutions per site per year. References External links Erratum in: MMWR Morb Mortal Wkly Rep. 2017 Jun 23;66(24):653. Swine diseases Tropical diseases Viral encephalitis Wikipedia medicine articles ready to translate Vaccine-preventable diseases