| pubmed-article:9342454 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:9342454 | lifeskim:mentions | umls-concept:C0042776 | lld:lifeskim |
| pubmed-article:9342454 | lifeskim:mentions | umls-concept:C0039005 | lld:lifeskim |
| pubmed-article:9342454 | lifeskim:mentions | umls-concept:C0376538 | lld:lifeskim |
| pubmed-article:9342454 | lifeskim:mentions | umls-concept:C0546816 | lld:lifeskim |
| pubmed-article:9342454 | pubmed:issue | 4 | lld:pubmed |
| pubmed-article:9342454 | pubmed:dateCreated | 1998-1-8 | lld:pubmed |
| pubmed-article:9342454 | pubmed:abstractText | An epidemiological study of porcine reproductive and respiratory syndrome (PRRS) within pig herds was conducted in 8 intensive farrow-to-finish pig farms. Persistence of PRRS virus (PRRSV) in pig herds was demonstrated by regular postmortem examination on 2 farms for a period of 2 y. Virus isolation and serum neutralization (SN) tests were performed on the sera collected from 9 groups of pigs (10 pigs/group) of various ages on 8 pig farms. Except for 1 farm, isolation rates of PRRSV reached the highest level of 70 to 100% of pigs 6 to 8 wk of age, which coincided with the lowest levels of maternal immunity. In 1 pig herd, sows (39 in total) with SN titers of < or = 1:2, 1:4-1:8, and > or = 1:16 were designated as groups 1, 2, and 3, respectively. Sera were obtained from their progeny (3 pigs randomly selected from each litter) at various ages from 0 to 22 weeks. A positive correlation (r = 0.377, P < 0.001) between the SN titers of sows and those of their progeny (1-week-old piglets) was observed. Pigs at the age of 6 wk, only 7.9% of group 1 pigs compared to 72.4% of group 3 pigs were seropositive. A significant difference (P < 0.01) in the percentage of pigs with PRRSV viremia among the 3 groups was observed, with the lowest level found in group 3 pigs. The isolation rates of PRRSV from serum reached the maximum at the age of 9 wk for all 3 groups. The results indicated that passively acquired serum antibodies conferred a protective effect for piglets; however, loss of passive immunity at various ages of pigs produced susceptible pigs that resulted in PRRSV persistence in the pig herds. Pigs 6 to 9 weeks old were the major reservoir for PRRSV in farrow-to-finish pig herds. | lld:pubmed |
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| pubmed-article:9342454 | pubmed:commentsCorrections | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:commentsCorrections | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:commentsCorrections | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:commentsCorrections | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:commentsCorrections | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:language | eng | lld:pubmed |
| pubmed-article:9342454 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:citationSubset | IM | lld:pubmed |
| pubmed-article:9342454 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:9342454 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:9342454 | pubmed:month | Oct | lld:pubmed |
| pubmed-article:9342454 | pubmed:issn | 0830-9000 | lld:pubmed |
| pubmed-article:9342454 | pubmed:author | pubmed-author:YangP CPC | lld:pubmed |
| pubmed-article:9342454 | pubmed:author | pubmed-author:HsuMM | lld:pubmed |
| pubmed-article:9342454 | pubmed:author | pubmed-author:ChungW BWB | lld:pubmed |
| pubmed-article:9342454 | pubmed:author | pubmed-author:ChangW FWF | lld:pubmed |
| pubmed-article:9342454 | pubmed:author | pubmed-author:LinM WMW | lld:pubmed |
| pubmed-article:9342454 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:9342454 | pubmed:volume | 61 | lld:pubmed |
| pubmed-article:9342454 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:9342454 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:9342454 | pubmed:pagination | 292-8 | lld:pubmed |
| pubmed-article:9342454 | pubmed:dateRevised | 2009-11-18 | lld:pubmed |
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| pubmed-article:9342454 | pubmed:meshHeading | pubmed-meshheading:9342454-... | lld:pubmed |
| pubmed-article:9342454 | pubmed:year | 1997 | lld:pubmed |
| pubmed-article:9342454 | pubmed:articleTitle | Persistence of porcine reproductive and respiratory syndrome virus in intensive farrow-to-finish pig herds. | lld:pubmed |
| pubmed-article:9342454 | pubmed:affiliation | Department of Veterinary Medicine, National Pingtung Polytechnic Institute, Neipu, Taiwan, R.O.C. | lld:pubmed |
| pubmed-article:9342454 | pubmed:publicationType | Journal Article | lld:pubmed |
| pubmed-article:9342454 | pubmed:publicationType | Research Support, Non-U.S. Gov't | lld:pubmed |
| http://linkedlifedata.com/r... | pubmed:referesTo | pubmed-article:9342454 | lld:pubmed |
