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California has been a hot zone for the H5N1 outbreak, representing the vast majority of infected cattle herds, and more than half the people sickened by the virus.

In recent years, she served as an executive producer on TV series including “Helix,” “Hot in Cleveland,” “Good Girls Revolt” and “The Hot Zone.”

The series of blasts in the Tierra Caliente — an area along the border of Jalisco and Michoacán states that has long been a hot zone for cartel warfare — mark an alarming escalation of violence in Mexico as criminal groups arm themselves with ever-more sophisticated and deadly weaponry.

“It bubbles, and keeps the temperature higher,” said Stephen Richer, the county recorder in Maricopa County, Ariz., a hot zone for election conspiracy theories.

Photos from the scene showed the small brown-brick apartment building cut off from the road by red and yellow tape saying: "Contaminated area - do not enter - hot zone".