On June 11, in response to the global spread of a new strain of influenza, the World Health Organization (WHO) raised the level of influenza pandemic alert to phase 6, which indicates the start of an actual pandemic. This change reflects the spread of the new influenza A(H1N1) virus, not its severity. Although currently the pandemic is of moderate severity with the majority of patients experiencing mild symptoms and making a rapid and full recovery, this experience could change.