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I have no clue. How can it pass from bird to human but then not from human to human? What has to happen for a virus that passes from one species to humans but not between humans, to become a virus that passes from human to human? I know it can happen when a pig gets a bird virus and the two together mutate into a third virus that can pass from swine to human and then human to human. But what happens in the virus that permits this to happen?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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