He bred his mosquitos in a bio-containment lab and he also used a species that's not native to the US so that even if some did escape, they'd just die off, there'd be nothing for them to mate with.
Viņš odus pavairoja bioizolētā laboratorijā un izmantoja sugas, kas nav sastopamas ASV, tāpēc, pat ja daži odi tiktu brīvībā, viņi vienkārši nomirtu, tiem nebūtu, ar ko pāroties.