Verwoerd, D J <br/><br/>
Experimental infection of vaccinated slaughter ostriches in a natural, open-air feedlot facility with virulent Newcastle disease virus.  [electronic resource] 

 -  Avian diseases   
 - 442-52 p.  digital 
<br/><br/> Publication Type: Comparative Study; Journal Article 
<br/><br/><label>ISSN: </label>0005-2086 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abattoirs<br/>Animals<br/>Antibodies, Viral--blood<br/>Antibody Formation<br/>Enzyme-Linked Immunosorbent Assay<br/>Newcastle Disease--immunology<br/>Newcastle disease virus--immunology<br/>South Africa<br/>Struthioniformes<br/>Viral Vaccines<br/>Virulence