Ricardo A.A. Lemos
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View article: Bovine herpesviral meningoencephalitis: large case study and literature review
Bovine herpesviral meningoencephalitis: large case study and literature review Open
Bovine herpesviral meningoencephalitis (BHM) is an infectious disease of cattle caused by bovine alphaherpesvirus 1 (BoAHV1; Orthoherpesviridae, Varicellovirus bovinealpha1 ) or 5 (BoAHV5; Orthoherpesviridae, Varicellovirus bovinealpha5 ).…
View article: The importance of veterinary diagnostic laboratories for disease surveillance, research, and postgraduate studies in animal health in Brazil
The importance of veterinary diagnostic laboratories for disease surveillance, research, and postgraduate studies in animal health in Brazil Open
This article describes the importance of Veterinary Diagnostic Laboratories (VDLs) for the development of animal health research and postgraduate education in Brazil. It also addresses the limitations, difficulties, and potential of these …
View article: Botulism in cattle in Mato Grosso do Sul: History, current situation, and perspectives
Botulism in cattle in Mato Grosso do Sul: History, current situation, and perspectives Open
Botulism is a neuroparalytic disease caused by ingesting neurotoxins (BoNTs) produced by the anaerobic bacterium Clostridium botulinum. It is a significant cause of cattle mortality in Brazil. BoNTs block the release of acetylcholine at th…
View article: The use of WhatsApp to identify previously undiagnosed and underreported ruminant and equine diseases in Mato Grosso do Sul
The use of WhatsApp to identify previously undiagnosed and underreported ruminant and equine diseases in Mato Grosso do Sul Open
This study explores the use of WhatsApp as a tool for identifying previously undiagnosed and underreported diseases in ruminants and horses in Mato Grosso do Sul, Brazil. The research, carried out from January 2022 to December 2023, involv…
View article: HPLC-DAD-MS/MS chemical characterization and evaluation of poisoning by Vernonia rubricaulis in sheep and mice
HPLC-DAD-MS/MS chemical characterization and evaluation of poisoning by Vernonia rubricaulis in sheep and mice Open
Vernonia rubricaulis is a plant responsible for poisoning cattle living in areas subject to flooding in the Pantanal biome of Brazil. Because V. rubricaulis causes acute hepatic necrosis and clinical signs and lesions similar to other hepa…
View article: Wischnewsky spots in cases of fatal hypothermia in cattle
Wischnewsky spots in cases of fatal hypothermia in cattle Open
Wischnewsky spots (WS) are hemorrhagic, non-erosive, and non-ulcerative lesions that affect the gastric mucosa. They are considered common in the stomachs of humans who have died from hypothermia and are rarely described in other animal sp…
View article: Cerebral Babesiosis: Transplacental Infection by Babesia bovis in a Calf
Cerebral Babesiosis: Transplacental Infection by Babesia bovis in a Calf Open
Background: Cerebral babesiosis is a significant cause of mortality in calves, as it can be transmitted through the placenta during gestation and presents with hemolytic and/or neurological symptoms. However, the role of this agent as a ca…
View article: Vitamin A deficiency as a cause of blindness in feedlot calves
Vitamin A deficiency as a cause of blindness in feedlot calves Open
Vitamin A is an essential micronutrient to reproduction, development, normal growth, and function of the nervous system and vision, especially in growing animals. Hypovitaminosis A can affect any of these functions. The aim of this study w…
View article: Urea poisoning in cattle: A brief review and diagnostic approach
Urea poisoning in cattle: A brief review and diagnostic approach Open
Urea is an organic compound characterized as a white, solid, and hygroscopic substance. It is recognized as a source of non-protein nitrogen (NPN) and is widely used as a partial replacement for protein in cattle diets due to the ability o…
View article: Use of smartphone messaging applications to increase diagnostic efficiency in veterinary diagnostic laboratories
Use of smartphone messaging applications to increase diagnostic efficiency in veterinary diagnostic laboratories Open
Many inconclusive diagnoses have been reported in studies carried out in veterinary diagnostic laboratories (VDLs). These inconclusive diagnoses are often associated with field veterinarians sending tissue samples and carcasses for histopa…
View article: Natural infestation by ticks as cause of death in beef cattle
Natural infestation by ticks as cause of death in beef cattle Open
Although infestation by Rhipicephalus microplus is mentioned as the cause of death among cattle, there are only studies with artificial infestations in which intense parasitism led to the death of cattle due to severe anemia. This study se…
View article: Mortality caused by gastrointestinal nematodes in beef cattle submitted to an inadequate sanitary protocol
Mortality caused by gastrointestinal nematodes in beef cattle submitted to an inadequate sanitary protocol Open
The aim of this study was to describe the epidemiological, clinical, and pathological findings of two outbreaks of gastrointestinal nematode infections in beef cattle kept under an inadequate sanitary protocol. An outbreak of trichostrongy…
View article: [Epidemiological and clinical-pathological aspects of an outbreak of nutritional myopathy in young horses ˗ case report]
[Epidemiological and clinical-pathological aspects of an outbreak of nutritional myopathy in young horses ˗ case report] Open
Nutritional myopathy is a degenerative disease caused by the dietary deficiency of selenium and/or vitamin E that can affect skeletal and cardiac muscles. The objective of this study was to report the occurrence of nutritional myopathy in …
View article: Protodioscin levels in Brachiaria spp. in a sheep production system and a brief review of the literature of Brachiaria spp. poisoning in ruminants
Protodioscin levels in Brachiaria spp. in a sheep production system and a brief review of the literature of Brachiaria spp. poisoning in ruminants Open
Plants of the genus Brachiaria, used in several countries as forage, are poisonous to some livestock species. Their toxic principle is protodioscin, and the main form of clinical presentation of the toxicosis is hepatogenous photosensitiza…
View article: Cobalt deficiency in cattle and its impact on production
Cobalt deficiency in cattle and its impact on production Open
Two outbreaks of cobalt deficiency in beef cattle were diagnosed in Midwestern Brazil. We discuss the clinical, epidemiological, pathological features, therapeutic measures, and impact aspects of the production system associated with these…
View article: Blackleg in inadequately immunized calves and their recovery following antibiotic therapy
Blackleg in inadequately immunized calves and their recovery following antibiotic therapy Open
Introduction: There is consensus regarding the importance of blackleg vaccination as a preventive measure, and proper immunization protocols are available. However, few studies have evaluated the effectiveness of vaccine protection against…
View article: Microfilaremia by Cercopithifilaria bainae in a dog from the central western region of Brazil: case report
Microfilaremia by Cercopithifilaria bainae in a dog from the central western region of Brazil: case report Open
Cercopithifilaria bainae is a nematode belonging to the family Onchocercidae that parasitizes the subcutaneous tissue of dogs. Its transmission occurs through the tick Rhipicephalus sanguineus and its geographical distribution overlaps tha…
View article: Approaches for a field diagnosis of abamectin poisoning in calves
Approaches for a field diagnosis of abamectin poisoning in calves Open
An approach for the diagnosis of an abamectin outbreak in calves in the field is described and discussed. In a Midwestern Brazilian property, nine out of a 52 newborn calves were affected and died, making up for morbidity, mortality, and l…
View article: Outbreak investigation of septicemic salmonellosis in calves
Outbreak investigation of septicemic salmonellosis in calves Open
Introduction: An early and accurate diagnosis of septicemic salmonellosis is critical for implementing timely and proper treatment, prevention, and control measures.
Methodology: Here, we report a study on three outbreaks of septicemic sa…
View article: Poisoning by Brachiaria spp. in various lamb breeds at increasing levels of supplementation during growth
Poisoning by Brachiaria spp. in various lamb breeds at increasing levels of supplementation during growth Open
The study evaluate the frequency of poisoning by Brachiaria spp. at the rearing, growth and termination stages in various lamb breeds at increasing supplementation levels. Forty-five lambs were used in the growth phase in pastures of Brach…
View article: Comparison of two collection methods to determine protodioscin concentrations in Brachiaria spp. and to monitor Brachiaria spp. Poisoning
Comparison of two collection methods to determine protodioscin concentrations in Brachiaria spp. and to monitor Brachiaria spp. Poisoning Open
The objective of this study was to evaluate the methods of collecting Brachiaria spp. (Simulated Grazing vs. Total Collection) for the determination of protodioscin concentrations and to monitor the intoxication in sheep susceptible and re…
View article: Cattle diseases in Mato Grosso do Sul, Brazil: a 24-year survey (1995-2018)
Cattle diseases in Mato Grosso do Sul, Brazil: a 24-year survey (1995-2018) Open
We reviewed the records of 5,083 cattle necropsies performed from January 1995 to December 2018 and filed at the Laboratory of Anatomic Pathology (LAP) of the “Universidade Federal de Mato Grosso do Sul” (UFMS). These necropsies were perfo…
View article: Salmonellosis in calves without intestinal lesions
Salmonellosis in calves without intestinal lesions Open
Salmonellosis is a known cause of enteric disorders in calves. However, cases in the septicemic form may not present enteric lesions, which may lead the veterinary practitioner to not suspect salmonellosis, compromising the diagnosis. The …
View article: Bovine rabies: economic loss and its mitigation through antirabies vaccination
Bovine rabies: economic loss and its mitigation through antirabies vaccination Open
Rabies is among the most common neurological disease in cattle in Brazil, causing significant economic losses. Data on the economic impact of rabies in livestock are available in several countries. However, in Brazil, these data focus main…
View article: Hepatic Encephalopathy Secondary to Chronic Liver Lesions Caused by Crotalaria incana in a Bovine
Hepatic Encephalopathy Secondary to Chronic Liver Lesions Caused by Crotalaria incana in a Bovine Open
Background: Crotalaria spp. Poisoning induces liver or pulmonary disease. C. mucronata, C. juncea, C. spectabilis, and C. retusa are the Crotalaria spp. inducing spontaneous intoxication in livestock in Brazil. C. mucronata and C. juncea a…
View article: Economic losses due to Vernonia rubricaulis poisoning in cattle
Economic losses due to Vernonia rubricaulis poisoning in cattle Open
Vernonia rubricaulis is a hepatotoxic plant found in the Pantanal biome. Under natural conditions, it is responsible for highly fatal poisonings in cattle. From January 1999 to December 2016, 33 outbreaks of V. rubricaulis poisoning were r…
View article: Economic impact of an outbreak of botulism in a cattle feedlot
Economic impact of an outbreak of botulism in a cattle feedlot Open
Botulism is a febrile disease, fatal in most cases, which affects the muscles of locomotion, chewing, and swallowing, as well as the diaphragm and intercostal muscles, causing flaccid paralysis and respiratory arrest. In bovines, the etiol…