Table 1:

Model parameters and their biological interpretations. All rates are in days unless specified otherwise.

Parameter	Biological interpretation
b(t)	Seasonally fluctuating birth rate
μ	Density independent death rate
k	Density dependent death rate
β	Transmission rate
γ	Rate of recovery from infection
ωA	Rate at which antibodies decay
ωT	Rate at which T-cell immunity decays