Dynamic Analysis of a VSEIR Model with Vaccination Efficacy and Immune Decline

Table 1

Equation (4). The sign change of factors and and the number of possible equilibrium points of endemic diseases.

Cases	Compare and	Coefficients		No. of possible positive roots
					+	+	1
	−		+	1
	−		−	0
		+	+	1
		−	−	0
		+	+	1
		+	−	2
		−	−	0