bursa of Fabricius

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bursa of Fa·bri·ci·us

 (fə-brĭsh′ē-əs, -brĭsh′əs)
n.
A lymphoid gland in birds that is connected to the cloaca and is the site of B cell maturation.

[After Hieronymus Fabricius (1537-1619), Italian anatomist.]

bur′sa of Fa•bri′ci•us

(fəˈbrɪʃ i əs, -ˈbrɪʃ əs)

n.
a lymphoid gland of the cloaca in immature birds.
[after Hieronymus Fabricius ab Aquapendente (1537–1619), Italian anatomist, who discovered it]
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Histopathological results at 4 and 7 weeks after IBD vaccine administration and the B:BW ratios demonstrated that live intermediate IBD vaccine could cause mild to marked lesions in the bursae of Fabricius, FIGS.
Transmission electron microscopy (TEM) indicated the presence of viral particles in the cytoplasm of lymphocytes and macrophages in the bursae of Fabricius from samples at 4 weeks after IBD vaccine administration.
Conversely, at 7 weeks after IBD vaccine administration, no evidence of viral particles was detected in lymphocytes or any other cell in the bursae of Fabricius.