云南临沧市牛羊犬弓形虫病血清学调查报告

为了解临沧市牛、羊和犬弓形虫感染情况,分别采集临沧市的临翔区、双江县、凤庆县和沧源县农户、养殖场和餐馆的动物血样品284份(牛143份、羊81份、犬60份),分离血清,采用间接血凝试验(IHA)进行弓形虫抗体检测。结果表明,弓形虫抗体阳性53份,阳性率18.6%,其中牛血清弓形虫抗体阳性20份,阳性率为14%;羊血清弓形虫抗体阳性19份,阳性率为23.5%;犬血清弓形虫抗体阳性14份,阳性率为23.3%。综上所述,临沧市牛羊犬弓形虫抗体阳性率较高,有兽医公共卫生安全隐患。     

石河子地区人畜弓形虫感染的血清学调查

为了调查石河子地区人畜弓形虫的感染情况,为本地区弓形虫病的防治提供科学依据,应用间接血凝试验(IHA)首次检测了石河子地区人血清336份、犬血清304份、猪血清456份和牛血清390份.结果显示,人、犬、猪和牛血清弓形虫抗体阳性数分别为18、32、139、181份,人、犬、猪、牛抗体阳性率分别为5.4%、10.5%、3...     

门源县东西部地区牛羊衣原体病的血清学调查

应用衣原体间接血凝实验(IHA)对来自青海省门源县东部地区的200份牛血清、200份羊血清进行了衣原体间接血凝抗体试验的检测。结果检出:牛阳性血清16份,血清阳性率为8.0%;羊阳性血清35份,血清阳性率为17.5%;说明在该县东西部地区的牛羊群中存在衣原体病的感染。     

青海省互助县藏羊弓形虫血清学调查

应用间接血凝试验(IHA)对青海省互助县8个地区的100份藏羊血清进行了弓形虫病调查,以抗体效价≥1∶64为阳性判定标准。结果显示,互助县8个地区藏羊不同程度感染了弓形虫,100份样本中共检出4份阳性血清,阳性率为4%。     

新疆北疆地区牛、羊病毒性腹泻—黏膜病的血清学调查

为了了解新疆北疆部分地区的牛、羊病毒性腹泻一黏膜病的感染情况,采用双抗原夹心酶联免疫法（ELISA）对随机采自新疆伊犁、塔城等地区的105份牛血清样品和49份羊血清样品进行BVDV抗体检测。结果显示,牛血清样品中有19份阳性,阳性率为18．1％;而羊血清样品中有45份阳性,阳性率为91．8％。结果显示,BVD在该地区较为流行,尤其是羊的感染率比较高。     

三种牛羊流产相关疫病在海西州的流行现状及分析

近年来,随着海西地区畜牧业的发展,牛羊流产现象也伴随多发,给牧民带来极大的经济损失。为调查布鲁氏菌病、衣原体病、弓形虫病在青海省海西州畜群中的整体流行状况,了解海西州牛羊流产多发的主要病因,对海西州31个乡镇97个牧业村的空怀牛羊群随机抽样,集中采血,分离血清,共分离牛羊血清共14114份,其中羊血清12620份,牛血清1494份。分别采用凝集试验、间接血凝试验和弓形虫快速检测卡对布鲁氏菌、衣原体和弓形虫进行抗体检测与数据分析。结果表明,羊布鲁氏菌、衣原体和弓形虫的抗体阳性率分别为0.056%、8.7%、0.11%;牛布鲁氏菌、衣原体和弓形虫的抗体阳性率分别为4.6%(69/1494)、5.8%(74/1494)、9.9%(87/1494),其中有15头牛同时检测到上述3种病原的抗体。海西州空怀羊群中衣原体阳性率最高,可能是导致羊流产的主要病因;空怀牛群中3种病原抗体阳性率普遍较高,且存在一定程度的共感染,流产病因较为复杂。     

延边地区鸭弓形虫感染情况的初步调查

为调查延边地区鸭弓形虫感染情况,用间接ELISA法对采自延边地区8个县市的鸭血清304份进行弓形虫抗体检测。结果显示,96份血清呈阳性,血清弓形虫抗体总阳性率为31﹒58%;不同地区阳性率之间有统计学差异(p 0﹒05)。本调查首次证实了延边地区鸭存在弓形虫感染,这对人和动物存在潜在威胁,应该引起相关部门的重视。     

大通县部分乡镇牛羊弓形虫病的血清学调查

为了解大通县牛羊弓形虫病流行情况,2018年在大通县的部分乡镇采集牛、羊血清300份和290份,采用间接血凝试验(IHA)方法进行了血清学检测分析。结果显示:牛弓形虫病阳性2份,阳性率0. 67%;羊弓形虫病阳性5份,阳性率1. 72%。表明大通县存在羊弓形虫感染,感染率较低,建议散养户应做好弓形虫病的防控工作。     

我国部分地区牛羊弓形虫血清流行病学调查

为了解我国牛羊弓形虫病流行情况,应用间接血凝试验（IHA）对河南、山东、山西、内蒙古、云南、贵州6省区151份牛血清、50份奶样、490份羊血清进行了弓形虫病血清流行病学调查。结果显示：151份被检牛血清和50份牛奶样品,弓形虫抗体均为阴性。490份羊血清弓形虫抗体总阳性率5.71％,其中母羊、公羊血清阳性率分别为4.03％和9.79％;山羊、绵羊、杂交羊血清阳性率分别为6.58％、4.81％和5.13％;阳性率最高的为公山羊（13.2％）,最低的为母绵羊（2.96％）。28份阳性羊血清中,75％的抗体滴度为1：64,25％的抗体滴度为1：256。1岁后的羊,随年龄增长,血清阳性率升高。     

永善县云南半细毛羊弓形虫病血清学调查

为了解永善县云南半细毛羊的弓形虫感染情况,利用弓形虫间接血凝试验(IHA)检测205份云南半细毛羊血清弓形虫抗体.结果显示:92份血清阳性,总阳性率为44.9％,其中雄性和雌性羊血清阳性率分别为50.0％、43.8％,不同性别云南半细毛羊弓形虫抗体阳性率差异不显著(P>0.05);年龄小于12月龄的羊血清样品阳性率为4...     

新疆阿勒泰地区绵羊弓形虫病的血清学调查

为了解新疆阿勒泰地区绵羊弓形虫病的感染情况以及感染弓形虫病与绵羊流产的关系,对阿勒泰地区6县1市的绵羊随机采集血清共565份,采用间接血凝试验进行了弓形虫感染的血清学检测。结果显示,阿勒泰地区各县(市)绵羊均有弓形虫感染,感染率高低不一,平均感染率为6.5%;在有流产史的绵羊中发现存在布鲁菌和弓形虫双重感染的情况,提示在预防和治疗绵羊流产时,除了要考虑布鲁菌感染的因素以外,还应考虑弓形虫感染这一因素。     

Survey of ovine and caprine toxoplasmosis by IFAT and PCR assays in Sardinia, Italy

During the period 1999-2002, we have analyzed 9639 serum samples and 815 aborted samples (670 fetuses and 145 placenta) from 964 ovine and caprine farms distributed over all Sardinia island. After abortion notification, sera collected at random from adult animals were examined to detect simultaneously IgG and IgM antibodies specific to Toxoplasma gondii by indirect immunofluorescence assay, whereas fetuses and placenta were analyzed by a single tube nested PCR assay. Specific IgG antibodies were detected in 2048 (28.4%) sheep and 302 (12.3%) goats, specific IgM antibodies were found in 652 (9%) sheep and 139 (5.6%) goats. From a total of 2471 ovine and 362 caprine fetal samples including muscle, liver, abomasum, spleen, brain and placenta, 271 (11.1%) ovine and 23 (6.4%) caprine samples were T. gondii PCR-positive. Although T. gondii DNA was amplified from different types of tissues, placenta was the tissue with the highest detection rate. On the one hand, these results indicate that the seroprevalence of T. gondii infection in sheep and goats is relatively high, on the other PCR results demonstrate that T. gondii has a significant role in ovine and caprine abortion. Adequate management might be useful and essential to control the toxoplasmosis in the sheep and goats herds of Sardinia.     

屠宰羊弓形虫感染情况调查

为了保障羊肉制品的生物安全,对屠宰羊进行弓形虫感染情况调查以及对羊肉进行弓形虫检测。采用间接血凝试验,对677份屠宰羊的血清进行了弓形虫抗体检测。结果显示,弓形虫抗体阳性有47份,阳性率为6.9%。     

Serologic prevalence of selected infectious diseases in cats with uveitis.

Serologic evidence of infection by Toxoplasma gondii, feline leukemia virus, feline coronaviruses, or feline immunodeficiency virus (FIV) is commonly found in cats with uveitis. Serum samples from 124 cats with uveitis were assayed by use of ELISA for the detection of T gondii-specific immunoglobulin M (IgM), IgG, and circulating antigens (Ag), as well as an ELISA for feline leukemia virus Ag, an ELISA for antibodies to FIV, and an indirect fluorescent antibody assay for antibodies to feline coronaviruses. Serologic evidence of infection by 1 or more of the infectious agents was detected in 83.1% of the samples. Serologic evidence of T gondii infection, defined as the detection of T gondii-specific IgM, IgG, or Ag in serum, was found in 74.2% of the samples. The seroprevalence of T gondii infection was significantly greater in cats with uveitis than in healthy cats from a similar geographic area. Serum samples from cats with serologic evidence of both T gondii and FIV infections were more likely to contain T gondii-specific IgM without IgG than samples from cats with serologic evidence of T gondii infection alone. Cats with serologic evidence of FIV and T gondii coinfection had a higher T gondii-specific IgM titer geometric mean and a lower T gondii-specific IgG titer geometric mean than did cats with serologic evidence of T gondii infection alone. Serologic evaluation for T gondii infection should include assays that detect IgM, IgG, and Ag, particularly in cats coinfected with FIV.     

Detection of Toxoplasma gondii antigens reactive with antibodies from serum, amniotic, and allantoic fluids from experimentally infected pregnant ewes

Toxoplasma gondii, an intracellular protozoan parasite, is one of the major causes of infectious abortion in sheep. To further understand the pathogenesis of toxoplasmosis, serum, amniotic and allantoic fluids and foetal stomach contents were collected from experimentally infected pregnant ewes to determine pathogen numbers and other markers of infection. Fifteen pregnant ewes (90 days of gestation) were each orally inoculated with 3000 sporulated oocysts of T. gondii. Serum samples were collected weekly following challenge. Amniotic and allantoic fluids and foetal stomach contents were collected at 21, 25, 28, 33 and 35 days post-infection. Characteristic placental lesions were detected in 1 of 4 challenged ewes at day 25, 3 of 4 challenged ewes at day 28 and in all challenged ewes at days 33 and 35 post-infection. T. gondii was detected only sporadically in amniotic and allantoic fluids before 35 days of infection, by real-time PCR, and only in ewes with placental lesions. At 35 days post-infection, high numbers of parasite were detected in both amniotic and allantoic fluids. An increase in the number of fluids from challenged animals with IgM and IgG was detected over time, except for IgG in allantoic fluid, which was detected in all samples from day 21 post-infection. IgG in amniotic and allantoic fluids was shown to be specific for T. gondii, and reacted with antigens with an apparent molecular mass of approximately 22 kDa and 30 kDa. Results suggest a maternal source of immunoglobulin in the allantoic fluid and a foetal source of immunoglobulin in the amniotic fluid early in infection but that both sources may contribute immunoglobulin to both fluids at a later stage.     

Toxoplasma gondii in sheep from the Campania region (Italy)

A cross-sectional serological survey was conducted in order to evaluate, irrespective of abortion, the Toxoplasma gondii infection in pastured sheep from the Campania region of southern Italy. A geographical information system was used in order to uniformly sample the ovine farms (n=117) throughout the entire region. Blood and milk samples were collected from 10 adult sheep (>18 months) on each farm (total number=1170 sheep). Serum samples were tested for the presence of IgG antibodies to T. gondii using a commercial indirect fluorescent antibody test. For each farm, the 10 milk samples collected were pooled in order to obtain a single milk sample per farm (total number=117 milk samples). The 77.8% (91/117) of the farms and the 28.5% (333/11,170) of the sheep resulted positive by serology. In addition, the presence of T. gondii DNA was detected by PCR in 4 milk samples out of the 117 examined (3.4%).     

猪瘟控制(净化)对母猪分娩率的影响

目的：通过对某猪场母猪实施猪瘟控制（净化）方案,研究分析能否提高该猪场的母猪分娩率。方法：采用酶联免疫吸附试验（ELISA）对龙岩市某规模化猪场的母猪进行猪瘟抗体检测,对猪瘟抗体检测不合格（阻断率小于40%）且同时满足两条及以上淘汰标准的种猪实行淘汰以达到猪瘟控制（净化）目的,并对猪瘟控制（净化）前后配种分娩结果进行收集、统计。结果：猪瘟控制（净化）后,母猪返情、流产、空胎数量减少,分娩率明显提升。结论：猪瘟控制（净化）可以提高母猪分娩率,实行猪瘟控制（净化）对规模化猪场具有重大意义。     

Seroprevalence and Toxoplasma gondii-IgG avidity in sheep from Lajes, Brazil

Sheep are important domestic animals in the Northeast region of Brazil due to their minimal rearing and maintenance costs, and to their production of both meat and milk. In animals, Toxoplasma gondii infection results in significant reproductive and economic losses. The epidemiology of toxoplasmosis in sheep in the Northeast of Brazil has been little studied; particularly in Rio Grande do Norte State. Sera from 102 sheep intended for consumption in Lajes were subjected to the Toxoplasma-ELISA test to detect anti-T. gondii specific IgG confirming a past infection. Of the total tested, 30 (29.41%) sera were positive for IgG with an increasing number of positive animals with advancing age. We used IgG avidity ELISA in 30 positive samples and observed that 6 (20%) had low avidity antibodies and 24 (80%) had high avidity antibodies. Epidemiological studies are required in order to identify sources of infection for these hosts as well as their impact on animal breeding in the region and risk of transmission to humans.     

Evaluation of a recombinant MIC3 based latex agglutination test for the rapid serodiagnosis of Toxoplasma gondii infection in swines

The entire gene encoding microneme protein 3 (MIC3) from Toxoplasma gondii was cloned into the plasmid pGEX-KG and subsequently expressed in Escherichia coli as a glutathione-S-transferase (GST) fusion protein. The recombinant MIC3 (rMIC3) was purified and evaluated in a latex agglutination test (LAT) as the diagnostic antigen for the detection of antibodies to T. gondii in pig sera. The specificity, stability, and reproducibility of the test were examined. No agglutination was found when the sensitized latex beads were mixed with phosphate-buffered saline (PBS), borate-buffered saline (BBS), normal saline, and negative serum samples. There was no cross-reactivity with the standard positive sera of other pathogens. But intense agglutination occurred with T. gondii antibody positive serum samples. In our study, the coincidence rate of tested positive-sera of the LAT with rMIC3-sensitized latex particles and the ELISA with rSAG1 was up to 92.8%, T. gondii specific antibodies were detected by the LAT in all piglets that were experimentally infected with T. gondii tachyzoites from 8 to 42 days after infection. Our results indicated that the rMIC3 based latex agglutination test appears to be suitable for the detection of T. gondii antibodies at the early stage of infection.