FYI be warned--over estimated 50% of the 80 on the Blue Danube cruise tested positive just now. Some tested positive while on cruise and rest the Thursday and Friday for the 24 hour test requirement. Many had just one spouse but later upon return since rules of NO test just happened then tested positive. Frankly think because there is poor air circulation on common areas on boat where meet and where dine. There is NO outside air. It was total chaos and poor Tauck direction on cruise. No one really knew what to do. Find it hard to believe as they said that NO one on the previous cruise had tested positive. It is not just Tauck either--there are also 40% positive rates on Viking currently. The no test rule will now let people be positive unknowlngly and travel.
So time being would not recommend cruises.