An epidemiological study of caprine arthritis encephalitis virus (CAEV) in breeder goats from Northeastern Brazil

Sousa, M. M. de; Pinheiro, Alyson Andrade; Pinheiro, R. R.; Alves, F. S. F.; Santos, Vanderlan Warlington Souza dos; Damasceno, Edgar Marques; Araújo, Juscilânia Furtado; Sousa, Ana Lídia Madeira de; Vieira, L. da S.

doi:10.5433/1679-0359.2019v40n5p1857

Cited by 4 publications

(3 citation statements)

References 20 publications

(29 reference statements)

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“…Studies report the occurrence of CAE and MV in various states of Brazil, with seroreactivity ranging from 0.29% to 17.6% (Bandeira et al, 2009;Sousa et al, 2019;Dorneles et al, 2020). The low seroreactivity to SRLV detected in the present study corroborates other studies performed in the northeastern region of Brazil.…”

Section: Discussionsupporting

confidence: 90%

Serological survey of leptospirosis, brucellosis, and lentivirus in herds of small ruminants in Recôncavo Baiano, Bahia, Brazil

Carvalho

Paz

Dias

et al. 2021

Braz. J. Vet. Res. Anim. Sci.

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A serological survey was carried out to assess the frequency of leptospirosis, small ruminants lentivirus (SRLV), and brucellosis in small ruminant herds in the Recôncavo Baiano, State of Bahia, Brazil, from February to December 2017. In four goat herds, 125 animals were tested for SRLV and leptospirosis, while in five sheep herds, 378 animals were tested for leptospirosis, brucellosis, and SRLV. Regarding leptospirosis, MAT detected 80% of goats and 15.34% of sheep seroreactive. Reactivity was most frequent to serogroups Autumnalis and Grippotyphosa in goats and sheep, respectively. Regarding SRLV, 8.8% of goats and 0.79% of sheep were reactive. Search for anti-B. ovis antibodies revealed 0.52% reactivity. In sheep, three animals showed simultaneous seroreactivity for SRLV and leptospirosis, while one animal had a serological response for brucellosis and leptospirosis. In goats, simultaneous seroreactivity for SRLV and leptospirosis was observed in only one animal. Leptospirosis was the most frequent of the three infectious diseases in investigated herds.

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Section: Discussionsupporting

confidence: 90%

Serological survey of leptospirosis, brucellosis, and lentivirus in herds of small ruminants in Recôncavo Baiano, Bahia, Brazil

Carvalho

Paz

Dias

et al. 2021

Braz. J. Vet. Res. Anim. Sci.

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“…These facts consequently tend to make the diagnosis difficult, even when using a more sensitive technique such as the WB (Peixoto et al, 2021), which has been proven to be a good tool for the early diagnosis of anti-SRLV antibodies and is used in several studies on this theme (Peixoto et al, 2018a;Sousa et al, 2019;Araújo et al, 2020;Damasceno et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Immune response dynamics of recent and chronic small ruminant lentivirus infection in the male reproductive system

Peixoto¹,

Pinheiro

et al. 2023

Sem. Ci. Agr.

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The objective of this study was to analyze the immune responses of bucks to small ruminant lentivirus (SRLV) with a focus on the reproductive system of males with recent and chronic infection. A total of 12 bucks were selected, six seronegative and six seropositive with chronic natural infection for more than 18 months (chronic infection group). After selecting the animals, the six seronegative males were intravenously inoculated with caprine arthritis-encephalitis virus (CAEV)-Co viral strain at a titer of 10-5,6 TCID50/mL. After viral inoculation, this group was called the recent infection group and was monitored weekly with the chronically infected group for 180 days with blood serum and seminal plasma Western Blot (WB) analysis. Of the animals with chronic SRLV infection, 18.94% (50/264) showed anti-SRLV antibodies in at least one of the samples, and 81.06% (214/264) were negative. Anti-SRLV antibodies were detected in 27.27% (36/132) of the blood serum samples from this group, while 10.60% (14/132) were reactive in the seminal plasma WB test. The animals inoculated with CAEV-Co became seropositive after the third week of viral inoculation. In this group, 31.06% (41/132) of seminal plasma samples had anti-SRLV antibodies, and of these, 70.73% (29/41) coincided with blood serum results. Of the remaining 29.27% (12/41), the seminal plasma sample of only three animals (RIA2, RIA3, and RIA5) had anti-SRLV antibodies. One of the animals with a recent infection presented anti-SRLV antibodies only in seminal plasma samples, possibly due to virus compartmentalization. Intermittent viral shedding was observed in both biological samples, regardless of the infection stage. The immune response in bucks with recent SRLV infection is more significant than in chronically infected animals. Regardless of the stage of infection, there is a fluctuation in antibody levels, therefore, this creates a risk of false-negative samples when performing the diagnosis.

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“…In Brazil, de Sousa et al (2019) described a rate of 6.2% infected animals in the northeast region, with the incidence of the disease occurring in 11.2% of the 251 studied properties. In the region of Rio Grande do Norte, Damasceno et al (2020) described 3.9% of infected animals in 42.6% of herds.…”

Section: Resultsmentioning

confidence: 99%

Influence of caprine arthritis encephalitis on milk production and quality along the lactation curve in primiparous dairy goats

Araujo

Schultz

Lima

et al. 2021

Semina: Ciênc. Agrár.

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The aim of this study was to examine the influence of caprine arthritis encephalitis (CAE) on the production of milk and its components (protein, fat and total solids) along the lactation curve of primiparous goats. The study was developed using a database from the years 2014 to 2018. Sixty-one animals were subjected to the serological test for CAE, whose result indicated that 42 were seropositive and 19 seronegative, and milk production and quality data were compiled. To adjust the curve for production of milk, fat, protein and total solids during lactation, the following nonlinear model developed by Wood (1967) was used: Y = atb e-ct, where Y represents the observations of milk, fat, protein or total solid production at time t; a is the parameter associated with the initial production; b is the parameter associated with the rate of rise in production until the peak; c is the parameter associated with the rate of decline of the lactation curve; and is the representative time of the day in milk. The parameters were compared by the confidence interval considering 95% probability. Peak production was calculated using the following formula: a(b/c)b e-b. There was no statistical difference (p > 0.05) between seropositive and seronegative primiparous goats for initial production and the rates of rise and decline of the parameters of milk, fat, protein and total solid production. However, at their peak, these variables were 26, 27, 23 and 23% higher, respectively, in the seronegative goats than in their seropositive counterparts. In conclusion, CAE does not affect milk production or the production of fat, protein and total solids along the lactation curve, but seropositive goats produce less milk and respective components at the peak of the lactation curve than seronegative goats.

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An epidemiological study of caprine arthritis encephalitis virus (CAEV) in breeder goats from Northeastern Brazil

Cited by 4 publications

References 20 publications

Serological survey of leptospirosis, brucellosis, and lentivirus in herds of small ruminants in Recôncavo Baiano, Bahia, Brazil

Serological survey of leptospirosis, brucellosis, and lentivirus in herds of small ruminants in Recôncavo Baiano, Bahia, Brazil

Immune response dynamics of recent and chronic small ruminant lentivirus infection in the male reproductive system

Influence of caprine arthritis encephalitis on milk production and quality along the lactation curve in primiparous dairy goats

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