{"id":8604,"date":"2022-08-26T08:57:00","date_gmt":"2022-08-26T12:57:00","guid":{"rendered":"https:\/\/vetanco.com\/en\/?p=8604"},"modified":"2026-03-10T09:35:51","modified_gmt":"2026-03-10T13:35:51","slug":"bvdv-immunosuppression-impact-cattle-herds","status":"publish","type":"post","link":"https:\/\/vetanco.com\/en\/bvdv-immunosuppression-impact-cattle-herds\/","title":{"rendered":"BVDV, immunosuppression, and its impact on cattle herds"},"content":{"rendered":"\n\n\n

Knowledge about the impact of this virus on production and control measures to mitigate its effect on the herd was disseminated at the Second International Congress on Bovine Viral Diarrhea Virus (BVDV), convened by Bioinnovo and INTA.<\/em><\/p>\n\n\n\n

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The\u00a0Second International BVDV Congress<\/strong>, held virtually by\u00a0Bioinnovo<\/a>, a public-private company formed by Vetanco and the\u00a0National Institute of Agricultural Technology (INTA)<\/a><\/strong>, was attended by leading national and international specialists who shared their knowledge on the Bovine Viral Diarrhea Virus (BVDV) and was followed by more than 1,500\u00a0people from various parts of the country and the world.<\/p>\n\n\n\n

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INTA authorities, Dr. Carlos Alberto Parera, National Director, and the Vice-President of the institution, Dr. Nacira Mu\u00f1oz<\/strong>, were in charge of welcoming the participants. The first presentation was given by Dr. Robert Fulton, Professor Emeritus of Oklahoma State University<\/a><\/strong> and an international reference in BVDV and cattle infectious diseases, who focused on the respiratory implications in meat and dairy herds.<\/p>\n\n\n\n

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\u201cWithin bovine diseases, the bovine respiratory complex (BRC) is one of the most important. Cases of bacterial pneumonia are the most severe manifestations of these conditions, and while bacteria are the culprits in pneumonia, the contributing factors are viruses and stress,\u201d Fulton explained.<\/em><\/p>\n\n\n\n

 <\/em>\u201cBVDV can facilitate bacterial colonization in the nasal and tracheal mucosa. A very important effect of these respiratory tract infections is their ability to suppress and destroy the defense mechanisms of the lungs. This is where the severe damage to the BRC lies. In addition, these viruses systemically and locally alter the correct functioning of the immune system, affecting both the cellular and humoral response (antibody generation),\u201d he said<\/em>.<\/p>\n\n\n\n

Therefore, for the Oklahoma State University professor, it is important to take care of the biosecurity of the herds as a preventive measure. \u201cIt was possible to detect at least one virus in 76.3% of the animals that were separated for BRC treatment and in 100% of the animals necropsied for BRC. Bovine coronavirus was the most commonly found virus in nasal swabs followed by BVDV and IBR.<\/em>\u201d<\/p>\n\n\n\n

 <\/em>\u201cAlthough the most important BRC manifestations occur in feedlots, the problem of BVDV starts in breeding herds\u201d<\/em> and that is why he suggested \u201c to implement an adequate vaccination program, practice biosecurity, and make sure to test the animals that are introduced to the herd\u201d<\/em>, Fulton said.<\/p>\n\n\n\n

Furthermore, Gabriel Bo, veterinarian and director of the Institute of Animal Reproduction of C\u00f3rdoba (IRAC)<\/a>,<\/strong> considered that Latin American cattle breeding \u201cmust produce more efficiently by acting on the factors that affect production<\/em>\u201d, such as the low weaning percentage<\/p>\n\n\n\n

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In this sense, the national and international referent in reproduction, embryo transfer techniques, and innovative technologies applied to bovine reproduction argued that it is necessary to work in the herds looking for \u201cmaximum efficiency to try to achieve one calf per cow each year. This means that all cows must be pregnant 85 days after calving\u201d<\/em>, that is, \u201cthere is a very short work window: there must be high efficiency.\u201d<\/em><\/p>\n\n\n\n

For Dr. Bo, the problem is generally due to herd management errors, but it is also important to design \u201ca complete sanitary program to prevent diseases<\/em>\u201d. In percentages, he stated that \u201cmore than 50% of gestation losses are infectious<\/em>\u201d, mostly due to BVDV.<\/p>\n\n\n\n

Bo said that BVDV affects reproduction because it has a very particular tropism on the ovaries and testicles, causing \u201creduced embryonic development and, therefore, fewer possibilities for the embryo to survive.\u201d<\/em><\/p>\n\n\n\n

When showing the results of the efficacy of Bioinnovo\u2019s VEDEVAX Block<\/strong> vaccine against the disease in affected herds, he explained that the response was \u201ca significant increase in the pregnancy rate and a decrease in abortion losses\u201d. <\/em>However, he noted that in addition to the vaccine, it is important to control the problem of persistently infected (PI) animals that can enter a healthy herd through a purchased cow pregnant with a BVDV-infected calf. \u201cThese are \u2018Trojan cows\u2019. When the calf is born, it spreads the virus, and a major complication occurs<\/em>.\u201d<\/p>\n\n\n\n

The IRAC director informed that there are only 1% of PI animals registered in Argentina. He said: \u201cThe problem<\/em> is that 20% of the herds have PI animals, and the fact that there are 1 or 2 infected animals will allow the disease to spread and produce a negative effect on the overall production of the whole herd.\u201d<\/em><\/p>\n\n\n\n

Next, Christopher Chase, Ph.D., South Dakota State University<\/a> Professor<\/strong>, is a researcher specialized in the immunosuppression caused by BVDV and the implications of this virus in the alteration of the cellular immune response.<\/p>\n\n\n\n

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Along with his team, they developed studies in the laboratories of the University of Dakota, USA, regarding the effect of the virus on the immune system, causing dysfunction of defense cells and immunosuppression. He detailed how the virus is related to immune dysfunction and immunosuppression and the behavior of macrophage monocytes, dendritic cells, and neutrophils in bovine animals.<\/p>\n\n\n\n

The professor reported that \u201cthe effect of BVDV on the immune system differs greatly with the strains, but all of them cause some degree of immunosuppression.\u201d<\/em><\/p>\n\n\n\n

In another regard, Dr. Chase detailed research carried out by his work group on immune development, especially with regard to persistent infection. \u201cThe virus manages to fool the immune system by infecting macrophages in the fetal liver. These infected macrophages then present the viral particles as their own, and that is why the immune system does not recognize the BVDV as foreign, resulting in the birth of PI calves.\u201d<\/em><\/p>\n\n\n\n

Then, Emanuel Gumina, UBA<\/a> VM Professor, researcher of Vetanco\u2019s Biotechnology Laboratory<\/strong>, introduced the evaluation of the cellular immune response induced by VEDEVAX Block<\/a>, developed by Bioinnovo<\/strong>, for a disease that causes considerable economic losses in cattle herds around the world and that is present in 90% of the Argentinean farms. This vaccine combines the BVDV E2 glycoprotein with the APCH targeting molecule, which has an affinity for the immune system.<\/p>\n\n\n\n

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Gumina detailed the mechanisms by which the targeted vaccine induces an effective cellular and humoral response through the presentation of different assays. He began by showing that \u201cit enhances the binding by the targeted antigen to antigen-presenting cells, and that this enhancement was 22 times greater<\/strong> compared to the untargeted antigen.\u201d<\/em><\/p>\n\n\n\n

\u201cIt is a vaccine that activates each step of the immune response by boosting it\u201d,<\/em> which is \u201creflected in the breeding, dairy, and feedlot field performance<\/em>\u201d, the researcher said.<\/p>\n\n\n\n

In the studies conducted at INTA, Gumina mentioned that there was a fourfold<\/strong> improvement in the amount of endocytosed antigen, which was faster and achieved a proliferation of specific T cells up to 10 times<\/strong> compared to the untargeted antigen. The immune response was polarized towards a Th1 profile necessary for the control of viral agents such as BVDV.<\/p>\n\n\n\n

In this regard, the head of Vetanco\u2019s Biotechnology laboratory said that \u201cthis is important because they end up polarizing towards a more appropriate response profile to stop the pathogen and differentiate these cells to generate effector and memory lymphocytes.\u201d<\/em><\/p>\n\n\n\n

When analyzing the humoral immune response, Dr. Gumina described that it was \u201cextremely efficient, being 66 times more effective<\/strong> than the untargeted antigen in the induction of neutralizing antibodies, which are necessary to protect the cattle since they prevent the virus from entering the cell\u201d. At the same time, he explained that \u201cthese antibodies had a 12-month<\/strong> persistence\u201d<\/em>, demonstrating the potency and duration of the immune response induced by VEDEVAX Block.<\/strong><\/p>\n\n\n\n

The closure of the virtual Congress was in charge of Vetanco\u2019s Livestock Commercial Manager and Veterinarian, Adrian Balbi.<\/strong><\/p>\n\n\n\n

On-site workshops<\/strong><\/p>\n\n\n\n

As complementary activities to the 2nd<\/sup> International BVDV Congress<\/strong>, five in-person workshops were also held jointly with INTA in different areas of the country, with the participation of more than 120 veterinarians in: Corrientes, INTA Mercedes, people in charge: Dr. N. Sarmiento, Veterinarian M. Acosta; Salta, INTA Cerrillos, people in charge: Dr. J. Micheloud, Veterinarian P. Bermudez; Buenos Aires, INTA Balcarce, people in charge: Dr. G. Cant\u00f3n, Veterinarian M. Schang; C\u00f3rdoba, IRAC, people in charge: Dr. G. Bo, Veterinarian G. Rodriguez Senes; and Santa Fe, INTA Rafaela, people in charge: Dr. A. Abdala, Veterinarian F. Tibaldo.<\/p>\n","protected":false},"excerpt":{"rendered":"

Knowledge about the impact of this virus on production and control measures to mitigate its effect on the herd was disseminated at the Second International Congress on Bovine Viral Diarrhea Virus (BVDV), convened by Bioinnovo and INTA. The\u00a0Second International BVDV Congress, held virtually by\u00a0Bioinnovo, a public-private company formed by Vetanco and the\u00a0National Institute of Agricultural […]\n","protected":false},"author":8,"featured_media":8613,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27,28],"tags":[19,21,23,60,20,59,61,24,18],"class_list":["post-8604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-events","category-news","tag-bioinnovo","tag-bovine-viral-diarrhea-virus","tag-bvdv","tag-institute-of-animal-reproduction-of-cordoba","tag-inta","tag-irac","tag-uba","tag-vedevax-block","tag-vetanco"],"yoast_head":"\nBVDV, immunosuppression, and its impact on cattle herds - Vetanco United States<\/title>\n<meta name=\"description\" content=\"Knowledge about the impact of this virus on production and control measures to mitigate its effect on the herd.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/vetanco.com\/en\/bvdv-immunosuppression-impact-cattle-herds\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BVDV, immunosuppression, and its impact on cattle herds - 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