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Establishment of a blocking ELISA for assessing neutralizing antibody levels against porcine epidemic diarrhea virus.

A highly specific blocking ELISA was developed for serological diagnosis of porcine epidemic diarrhea (PED) using monoclonal antibodies (mAb … no cross-reactivity with other porcine viruses, including African swine fever virus (ASFV), Porcine circovirus 2 (PCV2), Porcine deltacoronavirus (PDCoV), Porcine reproductive and respiratory syndrome virus (PRRSV), Porcine rotavirus (PoRV), and Porcine transmissible gastroenteritis virus (TGEV), and exhibited good reproducibility, with intra- and inter-batc …

Neospora caninum and/or Toxoplasma gondii Seroprevalence: Vaccination against PCV2 and Muscle Enzyme Activity in Seropositive and Seronegative Pigs.

Neospora caninum and Toxoplasma gondii affect both humans and animals worldwide. To investigate their seroprevalence and differences in seropositivity between pigs vaccinated and unvaccinated against porcine circovirus 2 (PCV2), as well as differences in muscle enzyme activity between seropositive and seronegative pigs, blood samples were collected from 380 sows. Antibodies against T. gondii and N. caninum were detected by an indirect immunofluorescence antibody (IFA) assay, while the activities of creatine kinase (CK) and aspartate aminotransferase (AST) were biochemically assessed. Out of th…

The Isolated in Utero Environment Is Conducive to the Emergence of RNA and DNA Virus Variants.

The host's immune status may affect virus evolution. Little is known about how developing fetal and placental immune milieus affect virus heterogeneity. This knowledge will help us better understand intra-host virus evolution and how new virus variants emerge. The goal of our study was to find out whether the isolated in utero environment-an environment with specialized placental immunity and developing fetal immunity-supports the emergence of RNA and DNA virus variants. We used well-established porcine models for isolated Zika virus (RNA virus) and porcine circovirus 2 (DNA virus) fetal infec…

Lesions associated with Bartonella taylorii-like bacterium infection in a free-ranging, young-of-the-year raccoon from Prince Edward Island, Canada.

A young-of-the year, female raccoon was presented with clinical signs of weakness and tremors. The raccoon was euthanized, and autopsy findi … orferi, Leptospira sp., Aleutian disease virus, canine distemper virus, feline coronavirus, porcine circovirus 2, and rabies virus. Transmission electron microscopy revealed large numbers of ~1.3 × 0.35 µm bacterial rods surrounded by a trilaminar cell wall located within the glomeruli and associated with aggregates of fibrin and vascular damage. Analysis of …

Establishment of a multiplex RT-PCR assay for identification of atmospheric virus contamination in pig farms.

Spread of pathogens in pig farms not only causes transfection of diseases to other pigs or even farmers working in the farms, but also induc … nese encephalitis virus (JEV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine circovirus Type 2 (PCV-2), porcine pseudorabies virus (PRV) and porcine parvovirus virus (PPV), which are common in pig farms. This method has a minimal detectable concentration of 10-3 ng/μL, which is highly specific. Furthermore, multiplex RT-PCR was applied …

Isolation and characterization of the first Chinese strain of porcine Teschovirus-8.

Investigations were carried out to identify the causal agent of acute diarrhea, respiratory distress, and death of pigs on a swine farm in J … of swine, porcine epidemic diarrhea virus, classical swine fever virus, pseudorabies virus, porcine circovirus, porcine reproductive and respiratory syndrome virus, Japanese encephalitis virus, Mycoplasma, Leptospira, Streptococcus, Listeria, and Brucella species) were excluded as possible causal agents because they were not associated consistently with the …

Множественные ПЦР и мультиплекс RT-PCR для инклюзивного обнаружения основных свиных ДНК и вирусов РНК у свиней с множественными инфекциями.

Для выявления девяти вирусов у свиней с множественными инфекциями были разработаны мультиплексные PCR и RT-PCR. К этим вирусам относятся: свиный цирковирус типа 2 (PCV2), специфический герпесвирус 1, свиный парвовирус (PPV), свиный вирус репродуктивного и дыхательного синдрома (PRRSV), японский энцефалитный вирус, свиный ротавирус A (PORV-A), свиный эпидемический диарейный вирус (PEDV), трансмиссивный гастроэнтерит (TGEV) и вирус Геты. Эти методы были продемонстрированы высокой специфичностью и деликатностью. В ходе клинического применения в общей сложности 75 полевых проб были изучены с помощ

Совпадение в аннотации оригинала
Multiplex PCR and multiplex RT-PCR were developed to identify nine viruses in pigs with multiple infections. These viruses are: porcine circovirus type 2 (PCV2), suid herpesvirus 1, porcine parvovirus (PPV), porcine reproductive and respiratory syndrome virus (PRRSV), Japanese encephalitis virus, porcine rotavirus A (PoRV-A), porcine epidemic diarrhea virus …

Poria cocos polysaccharide-honeycomb manganese oxide nanoparticles adjuvant enhanced immune responses to PCV2 vaccine via TLR4-mediated NF-κB activation enhanced STING pathway.

Adjuvants, as indispensable ingredients in vaccines, possess the capability to enhance the magnitude, breadth, and durability of immune resp … chanisms of DCs activation, and explored the potential adjuvant activity of the PMn for the porcine circovirus type 2 (PCV2) vaccine. It was found that the PMn promoted the DCs activation via both TLR4-NF-κB and cGAS-STING activation. And the TLR4-mediated NF-κB activation could enhance the STING activation. Furthermore, the PMn, as the adjuvant for the PCV2 …

Rapid Detection of Duck Enteritis Virus with MIRA, MIRA-qPCR, and MIRA-LFD Assays.

Duck viral enteritis (DVE) is an acute and highly contagious disease that affects waterfowl such as ducks, geese and swans. Duck enteritis v … erotype 4, novel goose astrovirus, Muscovy duck reovirus, avian influenza virus subtype H9, or duck circovirus. The basic MIRA reaction was completed in 30 min at 35 °C, requiring only a pair of primers. Detection with MIRA-qPCR or MIRA-LFD was completed within 20 min, and the limits of detection were 1 × 101 copies/μL for both. MIRA-LFD required no speciali …

Evaluation of CVC1302 for Improved Efficacy of FMD-Inactivated Vaccine in Oxidative Stressed Mice Generated with PCV2 Infection.

This study aimed to explore the effect of the immunopotentiator CVC1302 on foot-and-mouth disease (FMD) vaccination in animals placed under oxidative stress. We established oxidative stress models using porcine circovirus type 2 (PCV2)-infected PK-15 cells and mice model both in vitro and in vivo, respectively. The efficacy of CVC1302 on PK-15 cells or in addition to the FMD vaccine was evaluated by quantitative real-time polymerase chain reaction, histopathological and enzyme-linked immunosorbent assay (ELISA) analysis. CVC1302 affected apoptosis of PCV2-infected PK-15 cells and significantly…

Short Beak and Dwarfism Syndrome in Ducks in Poland Caused by Novel Goose Parvovirus.

Short beak and dwarfism syndrome (SBDS), which was previously identified only in mule ducks, is now an emerging disease of Pekin ducks in China and Egypt. The disease is caused by the infection of ducks with a genetic variant of goose parvovirus-novel goose parvovirus (nGPV). In 2019, SBDS was observed for the first time in Poland in eight farms of Pekin ducks. Birds in the affected flock were found to show growth retardation and beak atrophy with tongue protrusions. Morbidity ranged between 15% and 40% (in one flock), while the mortality rate was 4-6%. Co-infection with duck circovirus, a kno…

Unbiased analysis by high throughput sequencing of the viral diversity in fetal bovine serum and trypsin used in cell culture.

Fetal bovine serum (FBS) and trypsin are reagents used in cell culture and have been the source of viral contamination of pharmaceutical pro … imers generally used for the screening of BVDV. Viral sequences in trypsin were mainly from porcine circovirus type 2. Other known viral sequences at lower read counts and potential new viral species (bovine parvovirus and bovine pegivirus) were evidenced. The load of some known and new viruses detected by HTS could be quantified by qPCR. Results of HTS prov …

High frequency of postnatal transmission of TT virus in infancy.

DNA of TT virus (TTV), a novel human circovirus, was tested for in 116 mother-infant pairs who had participated in the adult T-cell leukemia prevention program (APP) in Nagasaki, Japan, and refrained from breast-feeding. By polymerase chain reaction with Okamoto's seminested primers, 36 of the 115 (31%) mothers were positive. At the age of 6-8 months, 7 of 29 (24%) and 6 of 72 (8%) infants born to infected and uninfected mothers were positive, respectively (P = 0.047; RR, 2.90). Maternal TTV DNA load did not correlate with infantile infections. Since 99 of 100 (99%) cord blood samples were neg…

Incidence and diversity of circoviruses, polyomaviruses, and adenoviruses in exotic free-roaming rosy-faced lovebirds from Phoenix, Arizona, USA.

Free-roaming rosy-faced lovebirds (Agapornis roseicollis) were first documented in the greater Phoenix area (Arizona, USA) in the mid-1980s and have since established small populations. In blood and cloacal swab samples from 69 lovebirds at four locations, we identified the presence of beak and feather disease virus (BFDV), aves polyomavirus (APyV), and psittacine adenovirus 5 (PsAdV-5). Additionally, we identified a novel aviadenovirus, hereby referred to as psittacine adenovirus 12 (PsAdV-12). PsAdV-12 is most closely related to members of the species Aviadenovirus senegalense and Aviadenovi

RPSA distribution and expression in tissues and immune cells of pathogen-infected mice.

AIMS: 40S ribosomal protein SA (RPSA), a component of the small ribosomal subunit, is a high-affinity receptor of laminin that is widely expressed in cells and involves in many biological processes. However, it hasn't been reported which tissues and cells may be targeted by RPSA-mediated pathogen regulation. Therefore, in this study, a gram-positive bacterium Streptococcus suis Type 2 (SS2), gram-negative bacterium Actinobacillus pleuropneumoniae (A.pleuropneumoniae), and porcine circovirus Type 2 (PCV2) were used to infect ICR mice. METHODS AND RESULTS: The effects of infection with the thre…

The Positive Correlation of the Enhanced Immune Response to PCV2 Subunit Vaccine by Conjugation of Chitosan Oligosaccharide with the Deacetylation Degree.

Chitosan oligosaccharides (COS), the degraded products of chitosan, have been demonstrated to have versatile biological functions. In primary studies, it has displayed significant adjuvant effects when mixed with other vaccines. In this study, chitosan oligosaccharides with different deacetylation degrees were prepared and conjugated to porcine circovirus type 2 (PCV2) subunit vaccine to enhance its immunogenicity. The vaccine conjugates were designed by the covalent linkage of COSs to PCV2 molecules and administered to BALB/c mice three times at two-week intervals. The results indicate that, …

A commercial PCV2a-based vaccine significantly reduces PCV2b transmission in experimental conditions.

Transmission characteristics of PCV2 have been compared between vaccinated and non-vaccinated pigs in experimental conditions. Twenty-four Specific Pathogen Free (SPF) piglets, vaccinated against PCV2 at 3weeks of age (PCV2a recombinant CAP protein-based vaccine), were inoculated at 15days post-vaccination with a PCV2b inoculum (6⋅10(5) TCID50), and put in contact with 24 vaccinated SPF piglets during 42days post-inoculation. Those piglets were shared in six replicates of a contact trial involving 4 inoculated piglets mingled with 4 susceptible SPF piglets. Two replicates of a similar contact

Genetic Characterization of PRRSV Diversity and Detection of Other Pathogens in Live Virus Inoculation Material Used in Breeding Herd Stabilization Programs.

Live virus inoculation (LVI) is widely used for porcine reproductive and respiratory syndrome virus (PRRSV) stabilization, yet preparation p … mic analysis detected a complete or near-complete genome for PRRSV, porcine parvovirus, and porcine circovirus type 2. Genome fragments of porcine sapovirus, porcine rotavirus, porcine astrovirus, and bacterial genetic material from Salmonella spp., Pseudomonas spp., Streptococcus spp., and Escherichia coli were also detected. These findings highlight substa …

An Autocatalytic Molecular Sensor Enables Rapid, Sensitive, and One-Pot Detection of Nucleic Acids.

Circulating nucleic acids are emerging disease markers whose clinical applications are hindered by the lack of rapid, sensitive, convenient, and cost-effective detection assays. Inspired by the natural replication of virus, here, we developed a biomimetic one-step, one-pot, isothermal detection assay named RAPID to realize rapid and sensitive detection of nucleic acids with minimal reliance on instruments. The core element of RAPID is an autocatalytic molecular sensor that exploits the viral replication endonuclease of duck circovirus (i.e., DCV) to transform rolling circle amplification (RCA)…

Suspected Type III Hypersensitivity Post-Inactivated Vaccination Leukocytoclastic Vasculitis in Two Sows.

This case report describes the investigation of two cases of cutaneous vasculitis in sows following vaccination. The herd was porcine reproductive and respiratory syndrome virus (PRRSV)-stable, with routine PRRSV-1 and porcine circovirus type 2 (PCV2) sows' vaccination. Two sows developed red-to-purple macules on the udder, flanks, and hind limbs, occurring two and three days after vaccination, respectively. Diagnostic investigations included biochemistry, complete blood count, PCR, immunohistochemistry (IHC), serology, histopathology, Gram staining, and immunofluorescence (IF) to assess the i…