Asymptotic analysis of a vector-borne disease model with the age of infection

Figures & data

Table 1. Number of positive zeros of H given in  (27(27) $H\left(\widetilde{E_h^{\ast }}\right)=m{\widetilde{E_h^{\ast }}}^2+n\widetilde{E_h^{\ast }}+q=0,$(27) ).

Cases	m	n	$n^2-4mq$	Number of positive zeros of H
${\tilde{R}}_0>1$	−	$N{R}^{\mathrm{a}}$	$A{P}^{\mathrm{b}}$	1
	+	−	+	2
	+	+	+	0
	+	NR	−	0
${\tilde{R}}_0<1$	+	NR	AP	1
	−	+	+	2
	−	+	−	0
	−	−	NR	0

${}^{\mathrm{a}}$means no restriction on the sign; ${}^{\mathrm{b}}$means always positive.