By 10 February 2004 there had been 23 cases of human infection with the H5N1 virus worldwide, with 18 deaths. This demonstrates the great potency and lethalness of H5N1.
截至二月十日為止，累計全球已有二十三例感染 H5N1 型病毒的人類病例，其中十八例死亡，由此可見 H5N1 的毒性強、致死率高。