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*The disease is inherited as an autosomal recessive trait, and heterozygous individuals show no signs. <br><br>
 
*The disease is inherited as an autosomal recessive trait, and heterozygous individuals show no signs. <br><br>
 
*Affected foals are usually normal at birth, and signs of infection (especially respiratory infections and pneumonia) become evident at any time between two days and two months depending on the level of passively acquired colostral immunity.
 
*Affected foals are usually normal at birth, and signs of infection (especially respiratory infections and pneumonia) become evident at any time between two days and two months depending on the level of passively acquired colostral immunity.
|l3=Category:Lymphocytes
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|l3=Lymphocytes - Introduction
 
|q4=What are the usual causes of the respiratory infections in this disease?
 
|q4=What are the usual causes of the respiratory infections in this disease?
 
|a4=Pneumonia caused by adenovirus, ''Pneumocystis carinii'' and a variety of bacteria are commonly involved.
 
|a4=Pneumonia caused by adenovirus, ''Pneumocystis carinii'' and a variety of bacteria are commonly involved.