RPT-UPDATE 1-Alaska says 5 swine flu cases on cruise liner

(Repeats to additional subscribers)

* Carnival's Holland America ship has 5 swine flu cases

* Follows month after Royal Caribbean cases

* Carnival, Royal Caribbean shares fall more than 2 pct (Adds background on previous swine flu cases)

By Yereth Rosen

ANCHORAGE, Alaska, June 8 (Reuters) - Five crew members on a Holland America cruise ship have been diagnosed with the H1N1 swine flu virus after tests in the Alaskan port of Ketchikan last week, according to the Alaska Division of Public Health.

The incident on the Carnival Corp (CCL.N)-owned cruise liner follows a month after rival Royal Caribbean (RCL.N) reported two probable swine flu cases among crew on one of its ships.

The crew members on Holland America's Zaandam were tested last Wednesday, and results of tests conducted by Alaska's virology laboratory turned out positive, said Dr. Beth Funk, an epidemiologist with the division.

A representative of Holland America, a unit of Carnival Corp, did not return a call seeking comment. The 780-foot Zaandam carries up to 1,432 passengers and 607 crew members, according to the company's website.

Carnival's shares closed down 2.2 percent at $25 on the New York Stock Exchange. Royal Caribbean shares fell 2.6 percent.

"We were asked to do the testing on some of the ill crew members when the ship was in Ketchikan last week," Funk said. Five specimens were taken, and "all five were positive for the novel H1N1 strain of influenza," she said.

Funk said she did not know what the crew members did after the tests results came back Thursday or where the ship was as of Monday, although it was believed to be heading into Canadian waters.

Alaska officials have notified their Canadian counterparts of the test results, Funk said. (Reporting by Yereth Rosen, writing by Bill Rigby; Editing by Gary Hill, Leslie Gevirtz)