RT Journal Article T1 Epidemiology of the Microsporidium Nosema ceranae in Four Mediterranean Countries A1 Jabal Uriel, Clara A1 Barrios, Laura A1 Bonjour Dalmon, Anne A1 Caspi Yona, Shiran A1 Chejanovsly, Nor A1 Erez, Tal A1 Henriques, Dora A1 Higes, Mariano A1 Le Conte, Yves A1 Lopes, Ana R. A1 Meana Mañes, María Aranzazu A1 Pinto, Maria Alice A1 Reyes Carreño, Maritza A1 Soroker, Victoria A1 Martín Hernández, Raquel AB Nosema ceranae is a highly prevalent intracellular parasite of honey bees’ midgut worldwide. This Microsporidium was monitored during a long-term study to evaluate the infection at apiary and intra-colony levels in six apiaries in four Mediterranean countries (France, Israel, Portugal, and Spain). Parameters on colony strength, honey production, beekeeping management, and climate were also recorded. Except for São Miguel (Azores, Portugal), all apiaries were positive for N. ceranae, with the lowest prevalence in mainland France and the highest intra-colony infection in Israel. A negative correlation between intra-colony infection and colony strength was observed in Spain and mainland Portugal. In these two apiaries, the queen replacement also influenced the infection levels. The highest colony losses occurred in mainland France and Spain, although they did not correlate with the Nosema infection levels, as parasitism was low in France and high in Spain. These results suggest that both the effects and the level of N. ceranae infection depends on location and beekeeping conditions. Further studies on host-parasite coevolution, and perhaps the interactions with other pathogens and the role of honey bee genetics, could assist in understanding the difference between nosemosis disease and infection, to develop appropriate strategies for its control. PB MPDI SN 2075-4450 YR 2022 FD 2022-09-13 LK https://hdl.handle.net/20.500.14352/73210 UL https://hdl.handle.net/20.500.14352/73210 LA eng NO ARIMNet2 2016 Call NO Ministerio de Asuntos Económicos y Transformación Digital NO FCT DS Docta Complutense RD 11 may 2025