Over the past several months we have noticed an increased number of canine parvovirus infections in our area. (aplusanimalhospital.com)
Less reliably low numbers (lymphopenia) occurs early in parvovirus infection in dogs and in panleukopenia of cats or after prolonged periods of stress. (2ndchance.info)
Finding that white blood cells are very low (lymphopenia) suggests a diagnosis of distemper, but lymphopenia also occurs with parvovirus infection. (1800petmeds.com)