{{Cite journal| doi = 10.1016/j.scitotenv.2021.147483| issn = 1879-1026 (Electronic) 0048-9697 (Print) 0048-9697 (Linking)| volume = 787| pages = 147483| last1 = Ladoy| first1 = A.| last2 = Opota| first2 = O.| last3 = Carron| first3 = P. N.| last4 = Guessous| first4 = I.| last5 = Vuilleumier| first5 = S.| last6 = Joost| first6 = S.| last7 = Greub| first7 = G.| title = Size and duration of COVID-19 clusters go along with a high SARS-CoV-2 viral load: A spatio-temporal investigation in Vaud state, Switzerland| journal = Sci Total Environ| date = 2021-05-18| pmid = 34000545}}