Egg drop syndrome - 76 (EDS)

AETIOLOGY:

Adenovirus EDS-76.

TRANSMISSION: 

• Horizontal transmission: direct by exudates, fundamentally from faeces. 
  
   
• Vertical transmission: transmission by egg is important, because apparently there is a relationship between hormonal changes during the beginning of laying and viral excretion. 

CLINICAL SIGNS: 

Lack of laying for approximately 3 to10 weeks. The drop percentage is variable and it is not usual to recuperate the levels obtained before infection. Eggshell colour and quality are affected.

LESIONS: 

Affects the oviduct and shell gland producing inflammatory alterations. 

DIAGNOSIS: 

• Causal agent identification: viral isolation. 
  
   
• Serological: ELISA, IHA. 

TREATMENT, PREVENTION AND CONTROL: 

There is no effective treatment and the most widely-used option for disease prevention is vaccination with inactivated vaccines during rearing.