The first officially confirmed fatality from the disease occurred April 13. Maria Adela Gutierrez died in the southern city of Oaxaca, capital of the state of the same name.

Gutierrez was a door-to-door census-taker for the tax board, meaning she could have had contact with scores of people at her most contagious point, before being hospitalized. But Martin Vazquez Villanueva, the regional health secretary in Oaxaca, denied local news reports that said she had infected 20 people, as well as her husband and children.

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