Fig 3. ${\mathbb{R}}_0$ changes with the increase of initial number of mosquitoes per person.

${\mathbb{R}}_0$ increases when few mosquitoes bite a person, and eventually decreases when there are many more mosquitoes than humans, ρ_vh > 40. In all cases, ${\mathbb{R}}_0$ for infection transmitted by Wolbachia-free mosquitoes is the largest, followed by ${\mathbb{R}}_0$ for infection transmitted by wAlbB-infected mosquitoes, and ${\mathbb{R}}_0$ for infection transmitted by wMel-infected mosquitoes is the smallest. (a) ${\mathbb{R}}_0$ for DENV transmitted by Ae. aegypti mosquitoes. (b) ${\mathbb{R}}_0$ for DENV transmitted by Ae. albopitus mosquitoes. (c) ${\mathbb{R}}_0$ for CHIKV transmitted by Ae. aegypti mosquitoes. (d) ${\mathbb{R}}_0$ for CHIKV transmitted by Ae. albopictus mosquitoes. (e) ${\mathbb{R}}_0$ for ZIKV transmitted by Ae. aegypti mosquitoes. (f) ${\mathbb{R}}_0$ for ZIKV transmitted by Ae. albopictus mosquitoes.