Fig. 4.

Epidemic curves, epidemics induced by phage instability. Initial phage density was set to zero; phage are provided by a small input from phage-infected individuals. y axis, number of disease cases; x axis, time in weeks; φ (ω, a), solid line, 1.5 (0.525, 7); dashed line, 2.0 (0.394, 7); dotted line, 3.0 (0.263, 5); dot-dashed line, 5.0 (0.158, 3). (Inset) Bacteria and phage densities over time, φ = 1.5, δ ∼ 5 × 10⁻⁵. Other parameters as in Fig. 3.