A closer look at the behind-the-scenes companies moving coronavirus vaccines around the world

Each step along transcontinental supply chains for delivery of those doses is vital and freight forwarders — the often behind-the-scenes transport companies that make the global economy hum — are the linchpins. They will ensure vaccine supplies are moved securely from pharmaceutical factories to health authorities, hospitals and clinics. For the leading vaccines, that means keeping doses cold and, in Pfizer's case, very, very cold.