Here is a complete review (and includes a meta-analysis) of how much Asymptomatic Individuals spread the virus: https://www.thelancet.com/journals/lanepe/article/PIIS2666-7762(21)00059-4/fulltext The TL:DR: Asymptomatic people can still spread the virus but to a far lesser extent than symptomatics. >Thus, we suggest that asymptomatic individuals are infectious during the early stage of infection, but some rare cases (3/100.000) become long-term virus carriers which are no longer infectious. This would reconcile the Wuhan post-lockdown study with the other studies including the one from Luxembourg. This conveys several important messages for science and public health: (i) During the acute phase of a COVID19 wave, asymptomatic individuals should definitively be included in the testing strategy and their contacts traced, because they can drive the inapparent spread the virus similar to symptomatic cases. (ii) Among AIC there is a category of rare long-term SARS-COV-2 carriers (3/100.000), with minimal risk for virus transmission, despite detectable viral RNA. (iii) Despite low absolute numbers, the proportion of this category of asymptomatic carriers will increase as the virus retreats. (iv) Finally, it cannot be excluded that rare long-term carriers may become virus reservoirs, with the potential to cause recurrent outbreaks. This has important implications for future SARS-COV-2 public health and surveillance, and our understanding of yet another pitfall of this cunning virus. https://www.thelancet.com/journals/lanepe/article/PIIS2666-7762(21)00059-4/fulltext