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Number 1  Volume 7  
 

Articles @ Virology

Lihong Ji, Jinsong Zhang, Yuqing Mi, Guoyu Niu

 

Abstract


 

Yellow fever is an acute infectious disease that caused by yellow fever virus, and it¨s one of the three infectious diseases of international health regulations. We tested people from epidemic areas of Tianjin port in 2014 to investigate the prevalence and distribution characteristics of yellow fever virus antigen. 192 samples were collected and the positive rate of yellow fever virus antigen was 12.5%. The positive rates among different countries, genders, ages, occupations and entry time were calculated and analyzed. The positive rate of workers engaged in labor was relatively high, and it had statistical significance compared to other occupations.


 

Keywords


 
Yellow Fever Virus; Antigen Detection; Prevalence and Distribution

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DOI: https://doi.org/10.21092/jav.v7i1.101

 

 

Number 2  Volume 7  

Articles @ Virology

Tailong Qu, RunCheng Li, BinYu Luo, MeiJun Yan, Meng Ge, TaoTao Yang, XingLong Yu

 

Abstract


 

Torque teno sus virus (TTSuV) has been detected in pigs with and without diseases. As China¨s pig population is booming, it¨s important to understand the prevalence of TTSuV in healthy pigs. The aim of this study was to systematically investigate the TTSuV prevalence rate in healthy pigs of different age groups, reared in intensive farms in the Hunan province of China. We detected TTSuV in 401 sera samples of healthy pigs by using PCR with primers located in the untranslated region (UTR). The positive prevalence rates of TTSuVs, TTSuV1, TTSuV2, and co-infection with TTSuV1 and TTSuV2 were calculated. The nucleotide identities of TTSuV1 and TTSuV2 between the reference and obtained sequences were calculated using the P-distance method, and maximum likelihood phylogenetic trees were created using MEGA6.0. TTSuVs were detected with an average frequency of 32.17%, while the frequencies of TTSuV1, TTSuV2, and co-infection with both TTSuV genogroups were 7.99%, 28.92%, and 4.74%, respectively. TTSuV1 and TTSuV2 were detected in pigs mainly in the age range of 12C16 weeks (positive rate >10%) and 8C18 weeks (positive rate >40%), respectively. The nucleotide identities ranged from 92.9%~97.3% for TTSuV1 and 64.7%~99% for TTSuV2 among the obtained sequences. We also observed diversity in TTSuVs based on the phylogenetic analysis of the UTR of the gene. Thus, our study shows the importance of understanding the distribution of TTSuV, which are potentially pathogenic agents in healthy pigs.


 

Keywords


 
Torque teno sus virus; Prevalence; Phylogenetic Analysis; Healthy Pigs; Pathogenic

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DOI: https://doi.org/10.21092/jav.v7i2.99

 

 
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Editorial Team

Honorary Chief Editor

Prof. Farhad Imani :ViraSource Laboratories, North Carolina,27709, USA

Chief Editor  

Dr.  Wenbo Zhang:North Carolina State Laboratory Of Public Health, Raleigh, North Carolina, USA

 Dr. Kongxin Hu:Chinese Academy of Inspection and Quarantine, China

Associate Chief Editor  

Dr. Tengchuan Jin: University of Science and Technology of China

Dr.  Tao Wang : School of Life Sciences,Tianjin University , China

Dr.  Fushun Zhang: The University of Texas Health Science Center at San Antonio, Texas, USA

Managing Director  

Dr.  Kai Wang:Institut Pasteur of Shanghai, Chinese Academy of Sciences, China

 

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