The number of jobs posted online rose by 9,000 in May to 4,374,400, an increase of 0.2 percent from April, the Conference Board reported Wednesday.

Online job vacancies were up 29 percent from the same period last year, the New York-based private research group said.

The gains are the result of an ongoing boom in health care, IT, business management, and other industries and occupations that advertise heavily online, according to Gad Levanon, a Conference Board economist.

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