Whooping Cough Epidemic

Julietta Losoyo, right, a Registered Nurse at the San Diego Public Health Center gives Derek Lucero a whooping cough injection while in his fathers Leonel’s arms as his brother Iker, 2, looks on, Wednesday, Dec. 10, 2014 in San Diego. California is battling the worst whooping cough epidemic recorded in the state in seven decades. State officials place much of the blame on a vaccine introduced in the 1990s that researchers say doesn’t seem to be working as well as expected. (AP Photo/Chris Carlson)

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