Vaxart, a San Francisco-based biotechnology company, is testing a tablet-form Covid-19 vaccine to tackle storage temperature problems, which affect even rich countries like the US, said founder Sean Tucker. “If it turns out that we will need to vaccinate people every year, it’s going to be a real challenge,” he added. “A tablet vaccine like ours … we dream that it’s going to be sent by mail, or even drone or some other delivery service, because it is room temperature stable, so you don’t have to deal with the problems with the cold-chain [infrastructure].”