No, it is justified because of the behaviour of flu. When it dies out in the northern hemisphere, outbreaks spread to the south, and then it can come back. In the past new flu viruses have disappeared, then returned a few months later far more deadly. This already has human to human infection possible, all it needs now is to infect a single human or pig already infected with H5N1 to produce a new strain of virulent human-human infection with a mortality rate of 60%.
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