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The exact mechanisms of CCD are still unknown. One report indicates a strong but possibly non-causal association between the syndrome and the presence of the Israel acute paralysis virus. Other factors may also be involved, however, and several have been proposed as causative agents; malnutrition, pesticides, pathogens, immunodeficiencies, mites, fungus, genetically modified (GM) crops, beekeeping practices (such as the use of antibiotics, or long-distance transportation of beehives) and electromagnetic radiation. Whether any single factor is responsible, or a combination of factors (acting independently in different areas affected by CCD, or acting in tandem), is still unknown. It is likewise still uncertain whether CCD is a genuinely new phenomenon, as opposed to a known phenomenon that previously only had a minor impact.