Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylogenetic analysis of the nucleoprotein (N) gene. A phylogenetic tree was constructed with MEGA 5.1 software using the maximum-likelihood method. Bootstrap probabilities greater than 85 % are shown at the branch nodes. Reference sequences for each genotype were obtained from GenBank
