Reuters
Klaus Stohr, head of WHO's global influenza program, said the world was totally unprotected against the potentially lethal bird-borne virus, which experts fear could mutate and spread among humans, possibly as early as this winter.
Only two drug companies are developing human vaccines for clinical trials in the United States, but rival firms have made no move, citing thorny patent issues and fears of making huge investments in a vaccine that may not be needed, Stohr said.
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