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What are the levels of danger of an infectious disease?

Base data: levels.
Alert levels related to an influenza pandemic announced by WHO

Alert levels of a pandemic

There has been increasing number of reports in recent years about new infectious diseases. In addition to new strains of influenza, there has been great uproar about Dengue fever and Ebola hemorrhagic fever. Let’s get a handle on the alert levels of an influenza pandemic as determined by the WHO.