The delivery of an effective and safe vaccine against coronavirus is a triumph of modern science. Vaccinations have begun in the UK, and will be followed in due course across the globe. The difficulties are immense: the first approved medication, manufactured by a partnership between the US pharmaceutical giant Pfizer and the German-Turkish firm of BioNTech, has to be stored at below 70 degrees Celsius. Other vaccines are in the pipeline, most of which are easier to handle. Literally billions of doses will eventually be required, and millions of trained personnel to administer them.