Warning on J&J; Australia-Singapore Travel Bubble: Virus Update Bloomberg 1 hr ago Bloomberg News (Bloomberg) -- U.S. regulators added a warning to Johnson & Johnson’s vaccine after a rare immune-system disorder was reported in about 100 of the more than 12 million people who received the inoculation. Data didn’t show definitively the shot had caused the Guillain-Barré syndrome, the Food and Drug Administration said. Australia has a “firm commitment” to launch a quarantine-free travel bubble with Singapore, which is more likely to now occur by the end of the year due to Sydney’s coronavirus outbreak, Australia’s top diplomat to the city-state said.