WASHINGTON – A little more than a year after first reporting phase IIb results showing oral TORC1 inhibitor RTB-101 reduced the number of respiratory tract infections (RTIs) in older adults, Restorbio Inc. is illuminating what may be the mechanism behind its efficacy: the up-regulation of innate antiviral immunity. The data, presented at the Infectious Disease Society of America's IDWeek 2019, put the company on track to move into two phase III data readouts next year.