NYT27 - (NYT27) HANOI, Vietnam -- Feb. 5, 2005 -- BIRD-FLU-SURVIVOR-2 -- Nguyen Thanh Hung, 42, playing his guitar at his house in Hanoi, Vietnbam, Feb.2, 2005. It started as a mild fever and severe chills on Jan. 9 that made Hung's teeth chatter even whe