Noro virus
We've been lucky too, but on a bunch of cruises (mostly Celebrity) over the past 15 years we took precautions - frequent hand washing, elbow or paper towel to open doors, don't touch stair rails, elevators, saline nose spray, etc. All these reduce the odds, but not to 0%.
A balcony seems a relatively small investment considering how nice it would be to use it if quarantined. The panoramic view and ability to sit out there sure beats spending a few days with your nose pressed against a small window.
Jack
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