local officials locked vo down, and crisanti's team tested all 3,000 residents. that allowed authorities to curtail infection at the earliest signs. >> if you find a cluster case, now with experience that we have in ily, you really need to bring the place to a standstill. nobody moves for three to four weeks, and you do test as many as possible around the place where the cluster has appeared. there's no other way. >> schifrin: crisanti's teamou t the infection rate in vo to zero. but he said italian authorities ntdidn't learn his most-ur lesson. >> nobody has ever won a war by building more hospitals. you have to build more weapons. and i think the weapon to win an epidemics, are measure of containment and surveillance and tracing.di i regret that not use my scientific approach to challenge and consolidate wisdom because, you know, i'm a scientist.d i tr convey in a polite, educated way.ho probablyd have been more aggressive. >> schifrin:espite the fear, italians have tried to maintain theisehope. despitration, they have maintained their connection. ♪ y ♪ in a lo