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      Using direct immunofluorescence to detect coronaviruses in peritoneal in peritoneal and pleural effusions

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          ABSTRACT

          Twenty‐one cases of feline infectious peritonitis (FIP) were diagnosed using a direct immunofluorescence test on cytocentrifuged pleural and peritoneal effusions from cats sampled in vivo (11 cases) and at necropsy (10 cases). A commercial fluorescent polyclonal antiserum of feline origin reacting with FIPV and cross reacting with transmissible gastroenteritis virus and canine coronavirus was used. Eleven cats with ascites of a different origin were used as negative controls. The direct immunofluorescence test was 97 per cent reliable (31 cases of 32) and can be used in routine diagnosis.

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          Antigenic relationship of the feline infectious peritonitis virus to coronaviruses of other species

          N C Pedersen, J. Ward, W L Mengeling (1978)
          Summary Utilizing the direct and indirect fluorescent antibody procedure, the antigenic relationship of the feline infectious peritonitis virus (FIPV) to 7 other human and animal coronaviruses was studied. FIPV was found to be closely related to transmissible gastroenteritis virus (TGEV) of swine. Transmissible gastroenteritis virus and FIPV were in turn antigenically related to human coronavirus 229E (HCV-229E) and canine coronavirus (CCV). An interesting finding in the study was that the 8 coronaviruses selected for this study fell into one of two antigenically distinct groups. Viruses in each group were antigenically related to each other to varying degrees, but were antigenically unrelated to coronaviruses of the second group. The first antigenically related group was comprised of mouse hepatitis virus, type 3 (MHV-3), hemeagglutinating encephalomyelitis virus 67N (HEV-67N) of swine, calf diarrhea coronavirus (CDCV), and human coronavirus OC43 (HCV-OC43). The second antigenically related group was comprised of FIPV, TGEV, HCV-229E and CCV.
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            Virologic and immunologic aspects of feline infectious peritonitis virus infection.

            Lisbeth N Pedersen (1986)
            A number of feline coronavirus isolates have been characterized over the last few years. These isolates consist of what we have referred to as feline enteric coronaviruses (FECVs) and feline infectious peritonitis viruses (FIPVs). FECVs cause a transient enteritis in kittens but no systemic illness. FIPVs, in contrast, cause a systemic and usually fatal disease syndrome characterized either by an exudative serositis or a disseminated granulomatous disease. Although the diseases they cause are quite different, FECVs and FIPVs are antigenically and morphologically indistinguishable from each other. FECVs have a strict tropism for mature intestinal epithelial cells and do not appear to replicate in macrophages. In contrast, FIPVs, appear to spread rapidly from the intestinal mucosa and replicate in macrophages. Experiments will be presented, and literature cited, that will allow us to make the following assumptions about the pathogenesis of FIPV infection: 1) FIPVs and FECVs represent a spectrum of viruses that differ only in infectivity (ability to evoke seroconversion following oral infection) and virulence (ability to cause FIP), 2) field isolates are generally nearer to FECVs in behavior than laboratory isolates made from animal passaged material, 3) immunity to FIPV appears to be of the premunition type and is maintained for as long as the infection persists in a reactivatable form, 4) strains of feline coronaviruses that do not cause systemic disease, such as FECVs or low virulence FIPVs, can actually sensitize cats to infection with virulent FIPV strains, 5) FeLV infection interferes with established FIP immunity and allows for the reactivation of disease in healthy carriers, 6) FIPV may be passaged from queen to kitten either in utero or during neonatal life, and 7) kittens infected by their mothers with FIPV do not usually develop FIP but become immune carriers of the virus for a period of 5-6 months; recovery from the carrier state is associated with a loss of premunition immunity.
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              Pathogenesis of feline infetious peritonitis: pathologic changes and immunofluorescence.

              R Weiss, F Scott (1981)
              Feline infectious peritonitis (FIP) was experimentally induced in FIP virus (FIPV) antibody-positive and antibody-negative kittens after challenge exposure to live-virus aerosol. Seropositive kittens developed antiviral immunofluorescence and lesions more rapidly after challenge exposure than did seronegative kittens. In seropositive kittens, FIPV antigen was present in macrophages and large mononuclear cells in tracheobronchial lymph nodes, lungs, and trachea on postchallenge-exposure day (PCD) 2; in liver and spleen on PCD 3; in kidneys and omentum on PCD 4; and subsequently in nasal turbinates, thoracic and abdominal lymph nodes, thymus, bone marrow, parotid salivary gland, eyes, and brain. Initial antiviral immunofluorescence on PCD 2 coincided with the onset of viremia and vascular lesions. Systemic lesions characterized by perivascular necrotizing pyogranulomatous inflammation, phlebitis and thrombosis, fibrinous serositis, and generalized lymphoid necrosis developed on PCD 3 and 4. Coronavirus-like particles were observed by electron microscopy in cytoplasmic vacuoles or smooth endoplasmic reticulum of degenerating macrophages in inflammatory lesions. In seronegative kittens, antiviral immunofluorescence in tracheobronchial lymph nodes was first detected on PCD 5, and viremia occurred on PCD 6. Systemic necrotizing lesions, comparable with those observed in seropositive kittens on PCD 3 or 4, did not occur in seronegative kittens until PCD 13 or 16. In both groups of kittens, initial viral infection in regional lymphoreticular tissue was followed by viremia and infection of macrophages in reticuloendothelial organs (liver, spleen, lymph nodes) and perivascular locations. The accelerated onset of infection and lesions indicative of an Arthus-type reaction in challenge-exposed seropositive vs seronegative kittens further supports the immune-mediated pathogenesis of FIP.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Small Anim Pract
                Journal ID (iso-abbrev): J Small Anim Pract
                Journal ID (doi): 10.1111/(ISSN)1748-5827
                Journal ID (publisher-id): JSAP
                Title: The Journal of Small Animal Practice
                Publisher: Blackwell Publishing Ltd (Oxford, UK )
                ISSN (Print): 0022-4510
                ISSN (Electronic): 1748-5827
                Publication date (Electronic): 10 April 2008
                Publication date (Print): December 1993
                Volume: 34
                Issue: 12 ( doiID: 10.1111/jsap.1993.34.issue-12 )
                Pages: 609-613
                Affiliations
                [ 1 ]Istituto di Anatomia Patologica Veterinaria e Patologia Aviare, Via Celoria 10, 20133 Milano, Italy
                [ 2 ]*Istituto di Patologia Generale Veterinaria, Milano, Italy
                [ 3 ]†Istituto Zooprofilattico Sperimentale, Brescia, Italy
                Article
                Publisher ID: JSAP609
                DOI: 10.1111/j.1748-5827.1993.tb02591.x
                PMC ID: 7166958
                SO-VID: c49b7baa-0e3c-4415-b639-0c8f312ef9d7
                License:

                This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

                History
                Page count
                links-crossref: 5, References: 38, Pages: 5
                Categories
                Subject: Original Paper
                Custom metadata
                source-schema-version-number 2.0
                cover-date December 1993
                details-of-publishers-convertor Converter:WILEY_ML3GV2_TO_JATSPMC version:5.8.0 mode:remove_FC converted:15.04.2020

                ScienceOpen disciplines: Veterinary medicine
                Data availability:
                ScienceOpen disciplines: Veterinary medicine

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