| 摘要 |
<p>The present invention provides improved vaccination methods for increased protection against ileitis. The methods provide for the vaccination of young animals, preferably piglets, between 10 and 26 days of age, vaccination of pregnant sows during the second or third stages of gestation, and a combination of these methods. Vaccination of the pregnant sows may occur using repeated and/or high doses of <i>Lawsonia</i> antigen prior to farrowing.</p> |
