Seroreactivity against Merkel cell polyomavirus and other polyomaviruses in chronic lymphocytic leukaemia, the MCC-Spain study Robles, Claudia and Casabonne, Delphine and Benavente, Yolanda and Costas, Laura and Gonzalez-Barca, Eva and Aymerich, Marta and Campo, Elias and Tardon, Adonina and Jiménez-Moleón, José J. and Castaño-Vinyals, Gemma and Dierssen-Sotos, Trinidad and Michel, Angelika and Kranz, Lena and Aragonés, Nuria and Pollan, Marina and Kogevinas, Manolis and Pawlita, Michael and de Sanjose, Silvia,, 96, 2286-2292 (2015), doi = https://doi.org/10.1099/vir.0.000167, publicationName = Microbiology Society, issn = 0022-1317, abstract= Merkel cell polyomavirus (MCPyV) has been suspected to cause chronic lymphocytic leukaemia (CLL) but previous data are inconsistent. We measured seroreactivities of nine polyomaviruses (MCPyV, BKPyV, JCPyV, LPyV, KIPyV, WUPyV, HPyV-6, HPyV-7 and TSPyV) in 359 CLL cases and 370 controls using bead-based multiplex serology technology. We additionally tested two herpesviruses (HSV-1 and CMV). Associations between disease and viral seroreactivities were assessed using logistic regression. All human viruses showed high seroprevalences (69–99 %) against structural proteins in controls but significantly lower viral seroprevalences in cases (58–94 %; OR range = 0.21–0.70, P value < 0.05), except for MCPyV (OR = 0.79, 95 % CI = 0.54–1.16). Lower seroreactivity levels were observed among CLL subjects, with significant differences already observed at early stages of disease, unrelated to treatment status. Seroreactivities against polyomavirus related oncoproteins were almost null. Our data suggest no association for MCPyV polyomavirus with CLL development and an unlikely association for other polyomaviruses tested., language=, type=