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Mean viral DNA load of the queens. The mean viral load (copies of Felis catus papillomavirus type 2 DNA per swab) with 95% confidence interval, for the four queens over the duration of the study. Between 17 and 20 samples were taken from each queen over a 10–12 month period. During this time the queens were housed individually, with their kittens, and in the outdoor run with other adult cats, yet the viral load on each queen remained relatively constant
