From the link
Angela Rasmussen, a professor and researcher of virology at the University of Saskatchewan, said even if the farm's surviving birds were tested, older ostriches often do not develop antibodies against viruses like avian#flu, meaning the tests cannot reliably determine whether or not the birds have immunity to H5N1.
"Simply having antibodies does not guarantee immunity to H5N1," Rasmussen told#CBC#News.
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