Circovirus has been identified in only 10 dogs who died between 2003 and 2013, and it's not yet clear what role it might have played in a number of recent canine illnesses in Ohio. "It would be easy to jump to conclusions, but this complex virus might even require a co-infection (of another virus) to make a dog as sick as those in Ohio were," said veterinarian Patricia Pesavento of the University of California, Davis. Ohio state veterinarian Tony Forshey also cautioned against premature conclusions. "The laboratory confirmation is important because the virus is newly isolated; however, we are not prepared at this time to confirm that canine circovirus is the cause of the dog illnesses," Dr. Forshey said.

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