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Avian influenza H9N2 seroprevalence among pig population and pig farm staff in Shandong, China.

Li S, Zhou Y, Zhao Y, Li W, Song W, Miao Z - Virol. J. (2015)

Bottom Line: However, thus far, serological investigation concerning H9N2 AIV in pig population and pig farm staff in Shandong is sparse.These findings revealed that there were H9N2 AIV infections in pig population and pig farm staff in Shandong, China.Therefore, it is of utmost importance to conduct the long-term surveillance of AIV in pig population and the pig farm staff.

View Article: PubMed Central - PubMed

Affiliation: College of Basic Medicine, Taishan Medical University, Taian, 271000, China. songli@126.com.

ABSTRACT

Background: Shandong province of China has a large number of pig farms with the semi-enclosed houses, allowing crowds of wild birds to seek food in the pig houses. As the carriers of avian influenza virus (AIV), these wild birds can easily pass the viruses to the pigs and even the occupational swine-exposed workers. However, thus far, serological investigation concerning H9N2 AIV in pig population and pig farm staff in Shandong is sparse.

Methods: To better understand the prevalence of H9N2 AIV in pig population and pig farm staff in Shandong, the serum samples of pigs and occupational pig-exposed workers were collected and tested for the antibodies for H9N2 AIV by both hemagglutination inhibition (HI) and micro-neutralization (MN) assays.

Results: When using the antibody titers ≥40 as cut-off value, 106 (HI: 106/2176, 4.87%) and 84 (MN: 84/2176, 3.86%) serum samples of pigs were tested positive, respectively; 6 (HI: 6/287, 2.09%) and 4 (MN: 4/287, 1.39%) serum samples of the pig farm staff were positive, respectively; however, serum samples from the control humans were tested negative in both HI and MN assays.

Conclusions: These findings revealed that there were H9N2 AIV infections in pig population and pig farm staff in Shandong, China. Therefore, it is of utmost importance to conduct the long-term surveillance of AIV in pig population and the pig farm staff.

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Related in: MedlinePlus

Location of Shandong province (highlighted) in China.
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Fig1: Location of Shandong province (highlighted) in China.

Mentions: Blood samples were collected from 50 pig fattening farms in 6 regions in Shandong province between May 2013 and April 2014 (Figures 1 and 2). All of these pig farms used the all-in-all-out breeding mode with semi-enclosed pig houses, and the breeding scales were from 500 to 1000 pigs. Since no separation nets were used in the pig farms, many wild birds frequently sought food in the pig houses and thus had chances to come into closer contact with the pigs, and even the staff. After obtaining the consent of the farmers, healthy fattening pigs weighing 30–50 kg that were not vaccinated with any influenza were randomly selected, and 30–50 blood samples were collected from each pig farm.Figure 1


Avian influenza H9N2 seroprevalence among pig population and pig farm staff in Shandong, China.

Li S, Zhou Y, Zhao Y, Li W, Song W, Miao Z - Virol. J. (2015)

Location of Shandong province (highlighted) in China.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4384234&req=5

Fig1: Location of Shandong province (highlighted) in China.
Mentions: Blood samples were collected from 50 pig fattening farms in 6 regions in Shandong province between May 2013 and April 2014 (Figures 1 and 2). All of these pig farms used the all-in-all-out breeding mode with semi-enclosed pig houses, and the breeding scales were from 500 to 1000 pigs. Since no separation nets were used in the pig farms, many wild birds frequently sought food in the pig houses and thus had chances to come into closer contact with the pigs, and even the staff. After obtaining the consent of the farmers, healthy fattening pigs weighing 30–50 kg that were not vaccinated with any influenza were randomly selected, and 30–50 blood samples were collected from each pig farm.Figure 1

Bottom Line: However, thus far, serological investigation concerning H9N2 AIV in pig population and pig farm staff in Shandong is sparse.These findings revealed that there were H9N2 AIV infections in pig population and pig farm staff in Shandong, China.Therefore, it is of utmost importance to conduct the long-term surveillance of AIV in pig population and the pig farm staff.

View Article: PubMed Central - PubMed

Affiliation: College of Basic Medicine, Taishan Medical University, Taian, 271000, China. songli@126.com.

ABSTRACT

Background: Shandong province of China has a large number of pig farms with the semi-enclosed houses, allowing crowds of wild birds to seek food in the pig houses. As the carriers of avian influenza virus (AIV), these wild birds can easily pass the viruses to the pigs and even the occupational swine-exposed workers. However, thus far, serological investigation concerning H9N2 AIV in pig population and pig farm staff in Shandong is sparse.

Methods: To better understand the prevalence of H9N2 AIV in pig population and pig farm staff in Shandong, the serum samples of pigs and occupational pig-exposed workers were collected and tested for the antibodies for H9N2 AIV by both hemagglutination inhibition (HI) and micro-neutralization (MN) assays.

Results: When using the antibody titers ≥40 as cut-off value, 106 (HI: 106/2176, 4.87%) and 84 (MN: 84/2176, 3.86%) serum samples of pigs were tested positive, respectively; 6 (HI: 6/287, 2.09%) and 4 (MN: 4/287, 1.39%) serum samples of the pig farm staff were positive, respectively; however, serum samples from the control humans were tested negative in both HI and MN assays.

Conclusions: These findings revealed that there were H9N2 AIV infections in pig population and pig farm staff in Shandong, China. Therefore, it is of utmost importance to conduct the long-term surveillance of AIV in pig population and the pig farm staff.

Show MeSH
Related in: MedlinePlus