2009 swine flu pandemic in Spain

In March and April 2009, an outbreak of a new strain of influenza commonly referred to as swine flu infected many people in Mexico and parts of the United States causing severe illness in the former. The new strain was identified as a combination of several different strains of Influenzavirus A, subtype H1N1, including separate strains of this subtype circulating in humans (see Human influenza) and in pigs (see Swine influenza). Spain was the first country in continental Europe to report cases of swine flu, in late April 2009.