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At least 1,315 records · Page 73Linked to original sources
PubMed1984

Response of puppies to canine-origin parvovirus vaccines.

Pups 9-18 1/2 weeks old were given a single dose of 1 of 4 commercial, live, canine-origin parvovirus vaccines. All 4 vaccines evoked high levels of antibody in seronegative pups, but variable response in those with low levels of maternally derived antibodies. Vaccinal virus spread to unvaccinated contact controls and elicited essentially equivalent titers. No clinical signs of parvovirus infection were observed in vaccinates or controls.

Animals↗
PubMed1981

Inhibition of T cell-mediated functions by MVM(i), a parvovirus closely related to minute virus of mice.

A purified preparation of MVM(i), a murine parvovirus closely related to minute virus of mice (MVM), was found to inhibit various functions mediated by murine T cells in vitro. Addition of MVM(i) virus to secondary allogeneic mixed leukocyte cultures resulted in the inhibition of both lymphocyte proliferation (3H-thymidine incorporation) and the generation of cytolytic T lymphocyte activity but not interferon production. MVM(i) virus also inhibited the growth and cytolytic activity of several cloned, long-term Lyt-2+ cytolytic T cell lines. Furthermore, the antigen-induced proliferative responses of parasite- (Leishmania) specific Lyt-1+ T cells in vitro was abrogated by the addition of MVM(i) virus to the culture. Finally, the suppression of an in vitro antibody response to SRBC by MVM(i) virus was the result of the inhibition of T helper cells required for the B cell response. These suppressive effects were specific for MVM(i); parallel studies in which the prototype MVM parvovirus was used showed no significant inhibition in the various systems tested.

Animals↗
PubMed1982

Generalized parvovirus disease in neonatal pups.

Generalized canine parvovirus disease was diagnosed in a litter of pups that died when 3 to 9 days old. Parvovirus was isolated from the heart, lungs, liver, kidneys, and small intestine. Histologically, lesions were characterized by hemorrhage and necrosis in the brain, liver, lungs, kidneys, lymphoid tissues, and gastrointestinal mucosa. Intranuclear inclusions were found in vascular endothelium, heart, lungs, liver, kidneys, adrenal cortex, and gastrointestinal tract.

Animals↗
PubMed1981

Canine parvovirus in a commercial kennel: epidemiologic and pathologic findings.

A study was conducted at a large canine commercial kennel that had suffered serious losses due to epidemic diarrheal disease following the introduction of canine parvovirus (CPV) into the kennel population. Mortality was highest in weaned (9- to 12-week-old) puppies coincident with the decline in maternal antibody titers. Virus was present in fecal samples from both fatal and non-fatal cases. Intestinal lesions of varying severity were present in dogs that died. One case of myocarditis occurred in a 5-week-old puppy. Reproductive performance was unaffected by the introduction of canine parvovirus into the kennel population.

Animals↗
PubMed1981

Experimental parvovirus infection in dogs.

Five eight week old dogs were inoculated orally and intranasally with cell culture origin canine parvovirus. Three dogs became depressed and anorectic and developed a mild (one dog) to severe diarrhea five days postinfection. The remaining dogs had subclinical infections but developed a lymphopenia followed by a transient lymphocytosis. The ill dogs developed mild (one dog) to severe neutropenia and a moderate lymphopenia. One died nine days postinfection. Recovery was associated with cessation of viral excretion and with lymphocytosis and antibody production. Two of three dogs challenged intragastrically developed mild clinical signs and a moderate panleukopenia four to eight days postinfection. The pathological changes of the experimental disease were very similar to that of spontaneous disease. Bone marrow changes included a severe granulocytic and mild erythroid depletion. The pathogenesis of canine parvovirus infection is discussed.

Administration, Intranasal↗
PubMed1980

Response of conventionally raised weanling pigs to experimental infection with a virulent strain of porcine parvovirus.

Conventionally raised 6-week-old pigs were inoculated intranaslly and orally with porcine parvovirus. The pigs remained clinically normal for up to 17 days. They were viremic between 2 and 6 days after inoculation and had detectable hemagglutination-inhibiting titers to porcine parvovirus at 5 or 6 days after inoculation. Virus was isolated from multiple tissues of pigs killed between 3 and 17 days after inoculation. Viral antigen was demonstrated mainly in lymphoid tissues of these pigs. Gross and microscopic examination of tissues failed to reveal any notable pathologic changes. The numbers of thymus- and bone marrow-derived lymphocytes did not differ significantly in inoculated and noninoculated control pigs, and the response of peripheral blood lymphocytes to selected mitogens was not altered by infection.

Animals↗
PubMed1994

Petechial glove and sock syndrome caused by parvovirus B19.

The petechial glove and sock syndrome is a recently described febrile dermatosis characterized by acral edema, petechiae in a characteristic distribution, and enanthem, which has been associated in several cases with parvovirus B19 seroconversion. We report an additional case of petechial glove and sock syndrome that further corroborates the role of parvovirus B19 as a causative agent of this syndrome in adults.

Adult↗
PubMed1994

Chronic modulation of the autoimmune response following parvovirus B19 infection.

We describe 2 patients with prolonged autoimmune alterations following parvovirus B19 infection. B19 induced aplastic crises were the revealing manifestations of asymptomatic hemolytic conditions in the 2 patients: a Coombs' positive hemolytic anemia induced by D-penicillamine in the first and congenital spherocytosis in the second. Both patients had transient clinical and serological manifestations highly suggestive of systemic lupus erythematosus. In addition, prolonged clinical and serological remission of rheumatoid arthritis was observed in the first patient, while arthralgias, FANA, and anti-Ro antibodies persisted in the second, previously healthy patient. Our data suggest that parvovirus B19 infection may lead to chronic modulation of the autoimmune response in predisposed individuals.

Adult↗
PubMed1993

Parvovirus B19 infection.

Human parvovirus B19 is a recently discovered and characterized DNA virus. B19 infection in the community is common and widespread. A number of well-known clinical syndromes have now been ascribed to B19 infection. Of rheumatologic interest, B19 infection causes adult erythema infectiosum which may be associated with a rheumatoid-like syndrome of symmetric polyarthralgia and polyarthritis. Presenting symptoms and signs may be limited to the joints. Some adults develop a chronic arthropathy that needs to be differentiated from early classic rheumatoid arthritis. Evidence for persistent B19 infection suggests that human parvovirus B19 infection may serve as a model for the study of virus-host interactions and the role of viruses in the pathogenesis of rheumatic diseases.

Arthritis, Infectious↗
PubMed1995

Successful treatment of parvovirus B19 infection and red cell aplasia occurring after an allogeneic bone marrow transplant.

Chronic parvovirus B19 infection in the immunocompromised host may cause severe anaemia secondary to failure of erythropoiesis. This has been previously documented in patients with the Acquired Immune Deficiency Syndrome (AIDS), congenital immunodeficiencies and in children with acute lymphoblastic leukaemia during maintenance chemotherapy. We describe persistent parvovirus infection in a 14-year-old boy after HLA-matched sibling allogeneic bone marrow transplantation for acute lymphoblastic leukaemia in second remission.

Adolescent↗
PubMed1998

Papular acrodermatitis of childhood related to poxvirus and parvovirus B19 infection.

Papular acrodermatitis of childhood (Gianotti-Crosti syndrome) is considered an unspecific cutaneous pattern related to an increasing number of infectious diseases. We report two cases of Gianotti-Crosti syndrome, one of which occurred in the setting of parvovirus B19 primary infection and the other followed poxvirus infection. Parvovirus B19 and poxvirus may represent new causative agents of Gianotti-Crosti syndrome.

Acrodermatitis↗
PubMed2004

A canine parvovirus mutant is spreading in Italy.

By antigenic and genetic characterization of canine parvovirus type 2 (CPV-2) strains collected in 2001 and 2002 in Italy, it was possible to observe the spread of viruses with an unusual mutation, Glu-426, affecting a major antigenic epitope of CPV-2. Out of 67 strains analyzed, 49 (73.13%) were characterized as CPV-2a, 6 (8.95%) were characterized as CPV-2b, and 12 (17.91%) were characterized as the Glu-426 mutant.

Animals↗
PubMedDate not supplied

Feto-placentary pathology in human parvovirus B19 infection.

In view of the scarce references concerning the histological data in congenital parvovirus human B19 infection, we intend to provide a description of the pathological features observed in six autopsies. The virus was detected by DNA hybridization (ISH-DBH), PCR and electronmicroscopy (EM) in paraffin-embedded feto-placentary tissues. These cases constitute a subset from 86 Non Immunologic Hydrops Fetalis (NIHF) cases, in which a systemic complex of inflammatory/degenerative lesions of unknown etiology was visualized by optical microscopy. In one case a syphilitic process was detected, typefying a double infection. All fetuses showed a similar pathology--hydrops, hepato-splenomegaly, lung hypoplasia and erythroblastemia, the specific histological feature being the presence of intranuclear inclusions in the erythroid progenitors, in the erythropoietic visceral tissue and in blood marrow. Complex cardiopathy allied to abnormal lung lobulation and polisplenia were observed once; in 2 cases endocardial fibroelastosis was diagnosed. The pulmonary lesions were represented by dysmaturity allied to interstitial mononuclear infiltration. The hepatic consisted of cholestasis, portal fibrosis, canalicular proliferation, hemossiderosis, focal necroses and giant cell transformation. The central nervous system lesions were predominantly anoxic although the autolysis impaired a correct diagnosis.

Erythrocyte Inclusions↗
PubMed1997

Parvovirus B19 quiescence during the course of human immunodeficiency virus infection in persons with hemophilia.

To detect and characterize parvovirus B19 infection during the course of progressive immune deficiency from human immunodeficiency virus (HIV), ten subjects enrolled in the Multicenter Hemophilia Cohort Study were followed for 6.4 to 15 years from HIV seroconversion through extreme immune deficiency. Four to five sera or plasma samples from each subject, collected at predetermined CD4+ lymphocyte levels, were tested for immunoglobulin G (IgG) and M (IgM) B19 antibodies and DNA. All 42 samples were positive for B19 IgG antibodies, and three were weakly positive for IgM antibodies. Only one sample, collected coincident with HIV seroconversion, was unequivocally positive for B19 DNA. No persistent hematologic adverse effects of B19 infection were observed. Thus, although B19 IgG antibodies are highly prevalent among HIV-infected persons with hemophilia or related disorders, B19 viremia and its hematologic consequences were not detected, even with severe depletion of CD4+ lymphocytes. If primary B19 infection occurs after immune deficiency, however, the consequences may be more adverse.

Adolescent↗
PubMed1998

Novel cytomorphology of the giant proerythroblasts of parvovirus B19 infection.

The morphology of the giant proerythroblasts (GPE) in air-dried and Wright-Giemsa-stained smears of bone marrow in 16 patients with pure red cell aplasia (PRCA) caused by parvovirus B19 infection is described. B19 infection was diagnosed by the presence of the virus or viral DNA and/or IgM antibodies. Twelve patients had chronic hemolytic anemia and aplastic crisis and 4 patients had AIDS with chronic PRCA. In patients with chronic hemolytic anemia and aplastic crisis, GPE were not detectable in bone marrow biopsies that showed any degree of recovery of erythropoiesis. The GPE morphology was quite variable. The early (basophilic) GPE measured 25 to 35 microm in diameter, had a narrow rim of intensely blue and often vacuolated cytoplasm with pseudopodia, round nuclei with compact uncondensed chromatin, and an indistinct and inclusion-like purple-colored tinctorial change. The "intermediate" and "late" GPE measured 25 to 45 microm in diameter and showed cytoplasmic swelling, gradual loss of cytoplasmic basophilia, and fraying of the cytoplasm with focal rupture; the nuclei showed an increase in volume, a highly uncondensed and coarse sieve-like chromatin, and 1 to 3 prominent, pale to moderate purple inclusion-like nucleoli or inclusions. Bare nuclei similar in size and chromatin pattern to those of the GPE were present in proximity to the GPE and may have arisen from the GPE by dissolution of the cytoplasm. The glassy intranuclear inclusions with central clearing, the so-called lantern cells described in formalin-fixed tissues of patients with B19 infection, were absent in all cases. These findings suggest that direct toxic cell injury rather than apoptosis may be involved in the pathogenesis of erythroid aplasia in B19 infection.

Acquired Immunodeficiency Syndrome↗
PubMed1996

Follow-up study of clinical and immunological findings in patients presenting with acute parvovirus B19 infection.

This study was undertaken to examine the natural history of parvovirus B19 infection in persons without a known immune defect in terms of both clinical symptoms and immune responsiveness to the virus. Fifty-three patients with acute B19 infection (positive for serum anti-B19 IgM) were studied; symptoms at acute infection were rash and arthralgia (n = 26), rash (n = 7), arthralgia (n = 16), aplastic crisis (n = 3), and intrauterine fetal death (n = 1). Patients were followed for 26-85 months (mean 57 months) and reassessed for persistent symptoms, anti-B19 antibodies, and antibodies to the unique region of B19 VP1. There were 23 cases of arthralgia persisting for longer than 1 year after acute infection. One of these patients, a 48-year-old woman at follow-up, had had persistent arthralgia for 4 years following acute B19 infection, had rheumatoid factor at a titre of 1920 IU/ml detected at follow-up, and had been independently diagnosed as having rheumatoid arthritis at the time of follow-up. All 53 patients were positive for serum anti-B19 IgG compared to 45 of 53 age- and sex-matched control patients, a significant difference (two-tailed P value = 0.008). All test patients at follow-up and control patients were negative for serum anti-B19 IgM and antibodies to the unique region of B19 VP1. Serum from acute infection from 33 of 53 test patients was tested for antibodies to the unique region of VP1, and 16 of these were positive. The presence of this antibody did not correlate with subsequent duration of symptoms but did correlate with a short interval between symptom onset and blood sampling. The unique region of B19 VP1 is known to be crucial for a successful humoral response to the virus, and it seems that the antigenic role played by this region is important only during the acute phase of B19 infection.

Acute Disease↗
PubMed1998

A clinical and epidemiological study of human parvovirus B19 infection in fetal hydrops using PCR Southern blot hybridization and chemiluminescence detection.

Ninety-eight samples from 80 cases of spontaneous abortions after fetal death or hydrops fetalis from 12,000 pregnant women were examined using PCR. DNA was extracted from amniotic fluid, fetal blood, ascitic fluid and fetal biopsies or placenta specimens using QIA amp kits (QIAGEN). A 270-bp length fragment located within the B19 gene NS1 was amplified using PCR followed by electrophoresis and southern-blot hybridization assay using a horseradish peroxidase-labelled probe and chemiluminescence detection. This assay was able to detect 1 to 10 DNA copies in a 10 microliters sample. Parvovirus B19 was identified in 11 cases (14% of fetal hydrops; 1 case for 1,100 pregnancies). Amniotic fluid was the most common and reliable sample to assess the diagnosis. Gestational age ranged from 17 to 28 weeks (mean 23 weeks). IgM antibodies were detected in 3 maternal sera, 2 patients of which reported an exposure to B19 infection during pregnancy. In 2 cases, intrauterine blood transfusions led to the cessation of symptoms and to birth of normal babies.

Adolescent↗