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 Pls help asap!  




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Am considering Fred Griffith's experiment (1982). When he injected the mice with the smooth strain pneumococcus, they died and more s-strain were discovered. He injected them with the rough strain and they died but no r-strain were found. am just wondering why they died after being injected with the r-strain because the r-strain were non-virulent and could have been destroyed by the immune system of the mice. Pls help asap!







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