NEW YORK : Fears that a shortage of glass vials could hinder efforts to quickly deploy a Covid-19 vaccine are prompting a flurry of deals to clinch the in-demand containers.The Coalition for Epidemic Preparedness Innovations, a global organization funding vaccine development, is the latest to announce such a pact, paying 19.7 million euros, or $22.2 million, to Stevanato Group, an Italian manufacturer of pharmaceutical containers, for 100 million glass vials that can hold up to 2 billion vaccine doses.The fast-moving hunt for a vaccine has led to worry that even if scientists hit their mark, logisitical hurdles and shortages of basic materials could hinder distribution.