A Mathematical Study of a TB Model with Treatment Interruptions and Two Latent Periods

Figure 7

The relationships between the reproduction numbers 𝑅₀, 𝑅_𝑡, and 𝑅_𝑡𝑖 and the transmission coefficient 𝛽₂. The green dash-dotted line, the red dashed line, and the blue solid line correspond to the reproduction numbers 𝑅₀, 𝑅_𝑡, and 𝑅_𝑡𝑖, respectively. 𝛽₂ is varied from 2×10⁻⁷ to 5×10⁻⁷. 𝑑₃=0.35, 𝛾=0.2, 𝑟=0.5, and 𝜉=0.06. Other parameter values are given in Table 1. And hence Δ₃=−0.1275<0.