Cunningham CK, Karron R, Muresan P, McFarland EJ, Perlowski C, Libous J, Thumar B, Gnanashanmugam D, Moye J, Schappell E, Barr E, Rexroad V, Aziz M, Deville J, Rutstein R, Yang L, Luongo C, Collins P, Buchholz U. Live-Attenuated Respiratory Syncytial Virus Vaccine With Deletion of RNA Synthesis Regulatory Protein M2-2 and Cold Passage Mutations Is Overattenuated. Open Forum Infect Dis. 2019 Jun; 6(6):ofz212.