Fig 2 -

(a) Life cycle of W. bancrofti. Image courtesy of Public Health Image Library, Centers for Disease Control and Prevention (https://phil.cdc.gov/Details.aspx?pid=3425). (b) Scheme of the ODE compartmental model for LF transmission from [27] with no treatment (after the termination of MDA). The human population is divided into uninfected Uh, latent Lh, and infectious Ih; the total population is Nh = Uh + Lh + Ih. Mosquitoes are either uninfected Uv, exposed Ev, or infected Iv; the total population is Nv = Uv + Ev + Iv. Solid arrows represent the transition of humans and mosquitoes between different states of infection. The letters next to the arrows specify the rates of the transitions. All new members of both populations enter their respective uninfected classes at per capita rates bh and bv. Both humans and mosquitoes leave their respective population through natural death at per capita rates δh and δv. The uninfected mosquitoes become infected at rate . The uninfected humans become latent at the rate , the force of infection. The latent individuals progress to infectious at rate α. The exposed vectors become infectious at rate σ. Dashed lines represent the transfer of parasites from human to mosquito and vice versa through a mosquito bite.