Respiratory syncytial virus (RSV) was particularly deadly in the very young, with 45% of those cases occurring in children under six months old.
Almost all the deaths occurred in low and middle-income countries.
But Professor Harish Nair, of the University of Edinburgh, who co-authored the study, said we are now seeing "a rebound" in cases as normal life resumes.
Dr You Li, co-author of the study, said the number of RSV cases was not a surprise, but they had not expected the deaths in the community outside hospital to be so high.
Overall, the study estimated that three-quarters of RSV deaths occurred outside hospital?
Dr Li said the high RSV death rate in low and middle-income communities was due to high population density, poor living conditions and limited access to health care?
He said: "In some resource-poor settings, for every RSV death found in a hospital, there can be as many as 13 more RSV deaths in the community.
RSV immunisation in low and middle-income communities would be an optimal solution to the prevention of RSV infections."?