From keeping coronavirus vaccines cold in tropical temperatures to ensuring they reach remote islands; a top drug distributor is gearing up for major challenges in shipping shots across Asia.Only a few countries in the region, which has generally not been as badly affected by COVID-19 as many parts of the West, have started inoculation drives in earnest.But campaigns are expected to be ratcheted up in the coming months and distributors will face a major test. One of Asia's bigge