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SALEM The whooping cough outbreak is getting worse in Oregon.

Health officials said Tuesday there have been 294 reported pertussis cases in Oregon, compared with 112 cases in May of 2011. That includes 11 infants who were hospitalized and all but one were 3-months old or younger, officials said.

In Washington there have been 1,738 cases reported compared with 148 during the same period of time in 2011.

Washington state's worst outbreak of whooping cough in decades has prompted health officials to declare an epidemic, seek help from federal experts and urge residents to get vaccinated amid worry that cases of the highly contagious disease could spike much higher.

It's the first state to declare a whooping cough, or pertussis, epidemic since 2010, when California had more than 9,000 cases, including 10 deaths.

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