21.   The virus can also be transmitted by contact between animals, through the air or through contaminated feed.

22.   The virus can be airborne, transmitted from one animal to another, contracted through contaminated feed, or carried by humans on boots, clothing and machinery.

23.   The virus, which causes weight loss and reduced dairy production, can also be airborne or contracted through contaminated feed.

24.   The virus can also be airborne, transmitted from one animal to another, or contracted through contaminated feed.

25.   The virus can be airborne, spread from one animal to another, transmitted through contaminated feed, or carried by humans on boots and clothing.

26.   The weekly science magazine Nature, citing British government statistics, said Thursday that thousands of tons of potentially contaminated feed was sold to France.

27.   -- The introduction of a programme for the selective slaughter of animals most likely to have been exposed to contaminated feed.

28.   The plan presumes that BSE infection is acquired by consumption of contaminated feed.

29.   Until then it was assumed that BSE was spread uniquely by contaminated feed.