Recombinomics speculates that recent testing done on a thousand human blood samples in Vietnam shows that at least one strain of H5N1 has spread widely in humans:
After the samples were tested in northern Vietnam an urgent meeting was called and the samples were said to have been shipped to CDC in Atlanta. Shortly thereafter another urgent meeting was called and he(l)d on May 6-7 in Manila. Although alarms were sounded, the results from the serum samples were not released, which would have created a dramatic jump in the number of H5N1 lab confirmed patrients, and signal phase 6 of the pandemic.
Instead, it sounds like another test was required, and when it also showed a high number of positives, the test was designated "research" and the data has still not been released.
So now there are hundreds of H5N1 positives in patients in Vietnam, but more tests are required, but Vietnam lacks the testing facilities. There is so much H5N1 outside the lab that H5N1 cannot be grown inside the lab.