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Table 2 HA titres of amniotic/allantoic fluids (AF) in three consecutive passages of AF or chorioallantoic membranes (CAM) homogenates

From: Chorioallantoic membranes of embryonated chicken eggs as an alternative system for isolation of equine influenza virus

CAM

AF

Dilution

10−6

10−7

10−8

10−8

10−8

10−6

10−7

10−8

10−8

10−8

1st passage

128

<4

<4

<4

<4

<4

<4

<4

<4

<4

(n = 3)

128

<4

<4

<4

<4

<4

<4

<4

<4

<4

 

256

<4

<4

<4

<4

<4

<4

<4

<4

<4

2nd passage

 

128

<4

<4

<4

<4

<4

<4

<4

<4

(n = 5)

 

<4

<4

<4

<4

<4

<4

<4

<4

<4

  

256

<4

<4

<4

<4

<4

<4

<4

<4

  

128

<4

<4

<4

<4

<4

<4

<4

<4

  

128

<4

<4

<4

<4

<4

<4

<4

<4

3rd passage

  

128

32

256

<4

<4

<4

<4

<4

(n = 5)

  

64

32

64

<4

<4

<4

<4

<4

   

128

64

1024

<4

<4

<4

<4

<4

   

128

8

2048

<4

8

<4

<4

<4

   

64

64

128

<4

<4

<4

<4

<4