Scientia Agricultura Sinica ›› 2022, Vol. 55 ›› Issue (2): 415-424.doi: 10.3864/j.issn.0578-1752.2022.02.015

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles    

Isolation and Identification of Brucella melitensis from Ticks on Cattle Surface in Hulunbuir Area

HUANG TianPeng1(),GUO Xu2,SUN ChangYun3,CHEN JingDiao3,CHAOMULIGE 1,WU Jie3,GERILETU 1()   

  1. 1College of Veterinary Medicine, Inner Mongolia Agricultural University,Hohhot 010018
    2Erguna animal disease prevention and control center,Erguna 022250, Inner Mongolia
    3Guangdong Provincial Center for Disease Control and Prevention,Guangzhou 511430
  • Received:2020-11-16 Accepted:2021-03-16 Online:2022-01-16 Published:2022-01-26
  • Contact: GERILETU E-mail:1401180252@qq.com;geriletusy@imau.edu.cn

Abstract:

【Objective】 The aim of this study was to elucidate the relationship between Dermacentor nuttalli and brucellosis in cattle and sheep. 【Method】 The species of ticks collected in Hulunbuir were identified by traditional morphological and molecular biology methods; the ticks collected from the cattle surface were used as materials, and the suspicious bacteria were isolated from their bodies. The isolated bacterial species were determined by methods, such as bacterial isolation and identification, morphological observation, serological detection and molecular biology. 【Result】 The dominant tick species were identified as D. nuttalli in this area, and four strains of suspicious bacteria were successfully isolated in their bodies. The isolated bacteria were gram-negative Brevibacterium by Gram staining, and the bcsp31 and omp22 gene sequences of Brucella were successfully cloned by PCR method. After gene sequencing and BLAST analysis, it was found that the similarity with the Brucella reference sequence was above 99.0%. The phylogenetic tree was successfully constructed by using Mega 7.0 software. The isolated strains were clustered in the same branch with the known sequences of Brucella. Using AMOS-PCR and Brucella typing test, four isolated strains were identified as Brucella melitensis. 【Conclusion】 In this experiment, four strains of B. melitensis were isolated from D. nuttalli collected from cattle in Hulunbuir area, which indicated that as a blood sucking arthropod, D. nuttalli might play an important role in the transmission of brucellosis among different hosts. This paper provided basic data for the investigation and control of Brucella in Inner Mongolia.

Key words: Dermacentor nuttalli, molecular biology, Brucella, Bcsp31, Omp22

Table 1

Primers sequences for PCR of mitochondria"

扩增片段 Amplified fragments 引物名称 Primer name 引物序列 Primer sequence (5'-3') 片段大小 Fragment size (bp)
16S rRNA 16Sf TGACTATACRAAGGTATTG,(R=A或G) 346
16Sr GGACGGACTCGTAGCCTG
CO І LCO1490 GGTCAACAAATCATAAAGATATTGG 658
HCO2198 TAAACTTCAGGGTGACCAAAAAATCA

Table 2

The primer sequence"

扩增片段 Amplified fragments 引物名称 Primer name 引物序列 Primer sequence (5'-3') 片段大小 Fragment size (bp)
Bcsp31 B4F TGGCTCGGTTGCCAATATCAA 223
B5R CGCGCTTGCCTTTCAGGTCTG
Omp22 Omp22F TGATGGGAGGGACCGACTA 498
Omp22R TGGTTCTTCAGGTTGTTACGC

Table 3

The primer sequence of AMOS-PCR"

引物名称
Primer name
引物序列
Primer sequence (5'-3')
片段大小
Fragment size (bp)
A GAC GAA CGG AAT TTT TCC AAT CCC 498
M AAA TCG CGT CCTTGC TGG TCT GA 731
O GCG CGG TTT TCT GAA GGT TCAGG 961
S GCG CGG TTT TCT GAA GGT TCAGG 285
IS711 TGC CGA TCA CTT AAG GGC CTT CAT

Fig. 1

Morphology of identification D.nuttalli specimens A:Female ticks; B:Nymphs; C:Male ticks a1、a2:Palp articles; b1、b2:Coxae; c1、c2:Valve plate; d1、d2:Festoon"

Fig. 2

Evolutionary relationships by NJ methods analysis in 16S rRNA gene sequences"

Fig. 3

Evolutionary relationships by NJ methods analysis in CO І gene sequences"

Fig. 4

Colony morphology of isolated bacteria A: Brucella colony in selective medium; B: Brucella colony in blood plate"

Fig. 5

Gram staining and Kirschner staining microscopic examination of isolated bacteria(×100) A:The results of microscopic examination with Gram staining;B:The results of microscopic examination with Kirschner's staining"

Fig. 6

phylogenetic tree based on Omp22 of Brucella"

Fig. 7

Identificated of Brucella by AMOS-PCR M: DL2000 DNA marker; 1-4: B. melitensis IMHT 5-B. melitensis IMHT8; 5: B. melitensis 16M strain; 6: B. abortus 544A strain; 7: B. suis 1330s strain N: negative control"

Table 4

The results of classification and identification of Brucella"

试验与结果
Experiment and result
B. melitensis NMT5 B. melitensis NMT6 B. melitensis NMT7 B. melitensis NMT8 参考标准株 International reference strains
16 M 1330S 544A
宿主Host 牛Cattle 牛Cattle 牛Cattle 牛Cattle
染料抑菌
Dye inhibition
硫瑾 Thionin + + + + + + +
碱性品红
Basic fuchsin
+ + + + + + +
噬菌体裂解
Lysis by phage at RTD
Tb RTD
104 Tb RTD
BK2
-
-
+
-
-
+
-
-
+
-
-
+
-
-
+
-
-
+
+
+
+
特异性血清
Agglutination on
reaction with
specific serum
A
M
R
+
-
-
+
+
-
+
+
-
+
-
-
-
+
-
+
-
-
+
-
-
CO2需求
CO2 requirement
- - - - - - -
产H2S
H2S production
- - - - + + +
结果
Result
种型
Species biotype
羊种2型
布鲁氏菌
Brucella
melitensis 2
羊种3型
布鲁氏菌
Brucella
melitensis 3
羊种3型
布鲁氏菌
Brucella
melitensis 3
羊种2型
布鲁氏菌
Brucella
melitensis 2
羊种1型
布鲁氏菌
Brucella
melitensis 1
猪种1型
布鲁氏菌
Brucella
suis 1
牛种1型
布鲁氏菌
Brucella
abortus 1
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