The Bruins have acquired Cohen from the Avalanche in exchange for Matt Hunwick, the team's official site reports.
Cohen was returned to AHL Lake Erie on Sunday, the Denver Post reports.
Cohen (illness) did not dress for Saturday's game against Detroit.
Cohen sat out most of the third period of Friday's game against Columbus with illness, but should be available for Saturday's matchup against Detroit, the Denver Post reports.
Cohen skipped practice Wednesday due to a bad cold, the Canadian Press reports.
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