Scientists are concerned that while the deadly H5N1 bird flu virus remains hard for people to catch, it could mutate into a form that can become easily transmissible among humans and spark a pandemic.
Naučnici su zabrinuti da bi se smrtonosni virus H5N1 ptičijeg gripa, mada se i dalje teško prenosi na ljude, mogao pretvoriti u oblik koji se lako prenosi među ljudima i izazvati pandemiju.