<div><p>The swine flu virus hasn't mutated into a more deadly strain but there are some signs it is developing resistance to current treatments, the World Health Organization's chief said Monday.</p><p>Authorities are monitoring closely whether the virus was morphing into more virulent forms that would make ...

<div><p>The head of the World Health Organization said Monday the swine flu virus had apparently not yet mutated into a more serious disease, but she is concerned about poorer nations' access to vaccines.</p><p>The number of swine flu cases is expected to rise as the Northern Hemisphere moves ...

<div><p>The head of the World Health Organization said Monday that the swine flu virus had apparently not yet mutated into a more serious disease and that the development of vaccines was proceeding on track.</p><p>The vaccines for (A)H1N1 influenza produced so far have been very effective, WHO ...

<div><p>The head of the World Health Organization said Monday that the swine flu virus had apparently not yet mutated into a more serious disease and that the development of vaccines was proceeding on track.</p><p>The vaccines for (A)H1N1 influenza produced so far have been very effective, WHO ...