Abstract

In the past several weeks, there has been an outbreak of illness in Mexico and the U.S. caused by a new strain of influenza virus that contains a combination of swine, avian, and human influenza virus genes. The illness has killed many patients, and the outbreak has features that suggest it could become a global pandemic. Federal officials have responded by declaring a public health emergency in the U.S., freeing up new resources for the prevention, diagnosis, and treatment of the disease. Pigs, birds, and humans are each susceptible to lots of influenza viruses. Typically, these viruses infect only one species. However, sometimes the viruses swap genes, creating new viruses that have the capacity to infect more than …

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