Diagnostic Notes
نویسنده
چکیده
1) The epidemic reproductive form of PRRSresults in late term reproductive failure.1,4,s,S,9 On newly infected farms, sows and gilts are often very susceptible to PRRSvirus. They become viremic for approximately 2 weeks and if infected in the last trimester of gestation, the virus crosses the placenta to infect the fetuses. Pigs, in utero, develop a prolonged viremia resulting in poor viability and death. Affected sows often farrow mummified, stillborn, weak-born, and normal pigs around days 107-109 of gestation. Weak-born piglets are usually born viremic and remain viremic for 3 or more weeks. Becausesows and gilts may be infected early in the last trimester and viremia in adults is transient, they may not be viremic at farrowing.
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تاریخ انتشار 2003