So it called PCI Pharma Services, a Philadelphia company that specializes in packaging and shipping drugs around the world. As countries prepare to distribute hundreds of millions of Covid-19 vaccines — some of which require storage as cold as the South Pole in winter and meticulous handling — the highly specialized operations of companies like PCI Pharma are in heavy demand. Investors were already snapping up shares of vaccine makers like Moderna and Pfizer, whose vaccine, developed with BioNTech, was introduced in the United States on Monday and requires an exceptionally low storage temperature of negative 70 Celsius. 