Table 2.

Summary of constant control.

	Endemic	Disease-free
Perfect restriction, no removal	R0 > 1	R0 < 1
Perfect restriction with removal	$R_0^{\mathrm{rem}}>1$	$R_0^{\mathrm{rem}}<1$
Imperfect restriction	Always	Never

Here, $R_0^{\mathrm{rem}}=\frac{R_0}{1+u_{\mathrm{rem}}}$.