1.
Which of the following organs/tissues are preferred for the isolation of infectious bronchitis virus from chickens infected 3 weeks ago with this virus?
2.
A virus was isolated from the respiratory tract of broiler chickens with respiratory disease. Negative contrast microscopy showed that the virus had club-shaped surface projections. The virus could be
3.
Which of the following is necessary for the in vitro growth of most isolates of Haemophilus paragallinarum?
