Parvoviruses cause infections in a wide variety of goose， Duck， birds and mammals. Parvovirus， commonly called parvo， is a genus of the Parvoviridae family linear， non-segmented single stranded DNA viruses with an average genome size of 5 kbp. Parvoviruses are some of the smallest viruses found in nature. Parvoviruses require actively reproducing cells in order to replicate， the type of tissue infected varies by the age of the animal. The gastrointestinal tract and lymphatic system can be affected at any age， leading to vomiting， diarrhea and immunosuppression.