"...we intensively sampled two sympatric parrot populations from Mauritius over a period of 11 years and screened for the circovirus Beak and Feather Disease Virus. During the sampling period a severe outbreak of Psittacine Beak and Feather Disease, which is caused by Beak and Feather Disease Virus, occurred in Echo parakeets. Consequently, this dataset presents an ideal system to study the evolution of a pathogen in a natural population and to understand the adaptive changes that cause outbreaks."
Reasonably good paper - and prescooped as a news item by both AJC and CU.
A couple of problems with it, however: first, they say "Circoviruses are amongst the smallest and simplest of all viruses, but are relatively poorly characterised." - and neglect to cite a paper which DOES thoroughly characterise BFDV diversity.
Varsani A, Regnard GL, Bragg R, Hitzeroth II, Rybicki EP. J Gen Virol. 2011 Apr;92(Pt 4):752-67.
Second, they refer to a "replicase gene" or allele: it's Rep, guys, for replication associated protein - a rolling circle replication initiator, and NOT a replicase.
Third - nah, that's enough.