The novel coronavirus infection COVID-19, caused by the SARS-CoV-2, has triggered a pandemic, and has also been reported in animal populations – in farm minks, dogs and felines: domestic cats, lions and tigers. The susceptibility of some animal species to the SARS-CoV-2 has been proven by experimental infection. Serological methods are effectively used to detect the infection in animals. Currently, methods such as neutralization test, immunofluorescence assay and enzyme-linked immunoassay are used to detect antibodies to coronaviruses. Thanks to these studies, a test kit was developed based on an indirect enzyme-linked immunoassay to detect the SARS-CoV-2 antibodies in sera of susceptible animals. The use of a purified concentrated inactivated virus as an antigen allows the detection of antibodies to various SARS-CoV-2 immunodominant proteins (S and N). The reaction conditions were optimized, and a positive-negative threshold was established by testing of 154 negative sera from animals of six species (ferrets, minks, foxes, arctic foxes, cats and dogs). The method reproducibility analysis showed that the average value of the variation coefficient did not exceed 7%, which is an acceptable value. The specificity and sensitivity of the neutralization test, when testing 30 sera from ferrets was 100 and 92.6%, respectively. The high diagnostic sensitivity and specificity shown by testing of 50 serum samples from minks, foxes, cats and dogs with different immune status, allow us to recommend the developed test kit for screening and monitoring tests and post-vaccination immunity control.
Development of specific protection in susceptible carnivores against COVID-19 caused by zoonotic agent is of great importance for maintaining epidemic and veterinary favourable situation in the Russian Federation and prevention of new coronavirus infection spread in humans. Development of inactivated adsorbed whole-virion vaccine (Carnivac-Cov) against coronavirus infection (COVID-19) for carnivores intended for specific disease prevention in fur animals and pet animals (cats and dogs) and tests of the vaccine for its safety and effectiveness are described in the paper. The vaccine was developed and tested at the FGBI “ARRIAH” (Vladimir) subordinated to the Rosselkhoznadzor in accordance with the Russian Federation legislation requirements. Clinical trials were carried out on fur farms, in veterinary clinics and animal shelters. More than 330 animals (fur animals, cats, dogs) were involved in the preclinical and clinical trials. The trials have demonstrated that the vaccine is safe for target animals. Carnivac-Cov vaccine administered twice intramuscularly at the dose of 1.0 cm3 induces anti-SARS-CoV-2 immune response 14 days after the second administration that lasts for at least 6 months. The vaccine transportation, storage and application do not require any specific protective equipment. The vaccine can be used on fur farms and in veterinary clinics without limitations. Carnivac-Cov is the first tool for specific COVID-19 prevention in animals. The vaccine has successfully passed comprehensive quality control and is registered in the Russian Federation.
Parvovirus enteritis is one of canine dangerous diseases which poses a particular concern for practitioners and dog owners around the world. Parvovirus type 2 (CPV-2) can affect dogs at any age, but puppies between 6 weeks and 6 months old are most susceptible to infection. One of the main biological properties of parvovirus is its continuous genetic evolution, which led to the replacement of the original virus type by new antigenic variants – CPV-2a, CPV-2b and CPV-2c. According to the literature data, all three variants of the virus are currently circulating in the domestic dog population worldwide. The paper presents analysis of the epidemic situation and seasonal occurrence of canine parvovirus enteritis in certain regions of the Russian Federation in 2017–2019. It was shown that parvovirus enteritis was ranked first among the registered infectious diseases of dogs and accounted for 37% during the study period. It has been established that the disease is registered all year round, but the frequency of disease cases depends on the season. Canine parvovirus infection mainly occurs in spring, late autumn and early winter, which is probably associated with changes in daily temperature during these periods and decreased animal resistance. Despite extensive vaccination, the main reason for the wide spread of the virus is either interference with maternal antibodies in vaccinated puppies or low level of immune protection in adult dogs.
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