To the Editor: Gyroviruses (GyVs) are naked, single-stranded DNA viruses that were described in chickens in 1979 (1). Chicken anemia virus (CAV), initially the sole member of the genus Gyrovirus (family Circoviridae), possesses a genome of ≈2.3 kb, containing 3 major partially overlapping open reading frames, viral proteins [VP] 1–3, and a short untranslated region (1). For >30 years, this viru...
