Can AstraZeneca dispel doubts about its shots? With the company caught up in murky data releases and public relations misfires, experts worry that the world may turn its back on a vaccine that still holds promise for combating the pandemic. ByLinda Marsa The AstraZeneca shot was supposed to be the vaccine for a couple of billion people. It is inexpensive at just a couple of dollars per dose and can be stored in an ordinary fridge unlike the mRNA vaccines. But after reports the shot may trigger a rare side effect, and the company’s string of communication blunders, public health officials worry that the people in some countries may have lost faith in the world’s most important vaccine.