title: Comment on "Transmission Model of Hepatitis B Virus with the Migration Effect".
abstract: Some consequences of erroneous results concerning eigenvalues in the recent literature of mathematical biology are highlighted. Furthermore, an improved stability criterion and the true value of the basic reproduction number is presented.
authors.affiliation: School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad 44000, Pakistan ; Department of Mathematics, Stockholm University, 10691 Stockholm, Sweden.
authors.forename: Abid Ali
authors.initials: AA
authors.lastname: Lashari
mesh_terms: D006509:Hepatitis B / Q000453:epidemiology* / Q000635:transmission*; D006515:Hepatitis B virus / Q000502:physiology*; D063426:Human Migration; D006801:Humans