has role virmugen virmugen role Human Respiratory Syncytial Virus gene M2-2 from Human Respiratory Syncytial Virus Rebecca Racz NCBI_Protein_ID: 81925031; PMID: 12922094 Oliver He An M2-2 mutant of human respiratory syncytial virus A2 is attenuated in African green monkeys. When challenged with wild type RSV, two doses provided complete protection against challenge in the lower respiratory tract and a significant reduction of the challenge virus in the upper respiratory tract gene