More than 30,000 samples of blood serum from domestic, wild and synanthropic birds from 50 regions of the Russian Federation were submitted to the FGBI “ARRIAH” (Vladimir) Reference Laboratory for Avian Viral Diseases to be tested for avian influenza and Newcastle disease within the framework of monitoring activities conducted by the Rosselkhoznadzor in 2019. As a result of the laboratory diagnosis, antibodies to type A influenza virus were detected in vaccinated chickens from two poultry farms in the Perm and Primorsky Krais (A/N9). The detected antibodies were specific to the haemagglutinin subtype of the vaccine antigen. As for the backyards in the RF Subjects, where scheduled vaccination against avian influenza A/H5 is carried out, a low level of immunity was seen in the Rostov and Astrakhan Oblasts (35 and 44%, respectively) while a high level of immunity was observed in the Republic of Altai, Krasnodar Krai, the Chechen Republic and the Primorsky Krai (69, 78, 80 and 88%, respectively). High seroprevalence of Newcastle disease virus in adult poultry in indoor holdings was associated with mass vaccination against the disease. In broiler chickens, post-vaccination antibodies were observed, on average, in 42% of the studied blood serum samples. Antibodies to the Newcastle disease virus were detected in 39% of samples from backyard chickens. Seroprevalence in wild and synanthropic birds was high. The obtained results suggest that the risk of introduction and spread of avian influenza and Newcastle disease in industrial poultry farms and in backyards remains.
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.
In 2019, the situation regarding Newcastle disease in the Russian Federation worsened radically due to the spread of NDV subgenotype VII-L throughout the country from the Primorsky Krai to the Kursk Oblast. As a result, 17 infected settlements with backyard farms where unvaccinated poultry was kept were registered. In this study, immunogenicity of the vaccines produced by the FGBI “ARRIAH”, as well as the effectiveness of various vaccination schedules to prevent genotype VII NDVs, relevant for the Russian Federation, was studied. It is known that the currently circulating ND agent is significantly more virulent compared to the viruses isolated in previous years, and it is able to bypass the immunity provided by live vaccines. Test results demonstrated that the vaccines against genotype VII NDVs produced by the FGBI “ARRIAH” are highly immunogenic, which allows to effectively prevent the disease when using them as part of a standard vaccination schedule. A 2-dose vaccination schedule using live vaccine from the La Sota strain as well as the “complete” vaccination schedule using inactivated vaccines provides immunity in 100% of chicks. The use of live vaccines in a single- and double-dose vaccination schedules prevents mortality and clinical disease in poultry, but does not prevent virus replication, while the addition of an inactivated vaccine to the immunization schedule does prevent the replication of the virulent virus. Thus, the use of domestically produced live and inactivated vaccines, primarily the ones containing the La Sota strain, with the following control of the immunity level and booster vaccination, if required, is the main tool for the disease control.
Newcastle disease is an OIE-listed and highly contagious viral avian disease inflicting great economic losses and constituting a serious threat to poultry farms all over the world. The paper provides monitoring research results for Newcastle disease among poultry and wild birds in the Russian Federation for 2017. The tests were carried out with diagnostic kits for Newcastle disease virus antibody detection by immunosorbent assay and HI at the FGBI “ARRIAH” Reference Laboratory for Viral Avian Diseases (Vladimir). Biological material delivered from Rosselkhoznadzor Territorial Administrations was collected from 31 678 domestic and 433 wild and synanthropic birds from 22 and 4 regions of the Russian Federation, respectively. The paper shows different levels of seroprevalence in poultry from industrial poultry establishments of a closed type and backyards and in wild birds of various regions of the Russian Federation. Almost total Newcastle disease seroprevalence was found in adult poultry from industrial closed establishments due to a total vaccination against the disease. Broilers demonstrated a relatively low average Newcastle disease virus seroprevalence because of an insufficient antibody level by the moment of blood sampling (mostly during slaughter). On average, antibodies to Newcastle disease virus were detected in one third of samples from backyard poultry. With that, high seroprevalence was registered on farms of North Caucasian Republics and southern regions of the Russian Federation. Seroprevalence in wild birds was moderate. Thus, the monitoring research indicates an unstable epidemiological situation for Newcastle disease in the Russian Federation and the remaining risk of disease outbreak on industrial and backyard farms.
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