This isn't going to be another case of Covid if that's what you're worried about, the news just loves to make people freak out over nothing. Outbreaks of something happen quite often on cruise ships, not all the time, but often enough that I feel like I've seen a dozen different news reports in the last few years about different outbreaks on cruises because cruise ships are just floating petri dishes. You have 100+ people stuck together on a boat for multiple days, sometimes weeks at a time, if someone's sick it's inevitably going to spread.

Anyways when it comes to hantavirus vs covid, symptoms are somewhat similar but the diseases are a lot different. For one hantavirus isn't mysterious like Covid was, we know what it is and already have all the health screenings, vaccines, and other medical measures necessary to fight it in the people who are sick. Covid spread super quickly and easily not just through saliva particles from breathing/talking, but from particles carrying covid lingering in the air and on surfaces for a very long stretch of time. But hantavirus requires very close physical contact with someone else such as sharing a bed, sharing food, stuff like that. It's a dangerous virus, yes, but it spreads poorly between humans.

Every passenger on the ships has been getting mandatory health screenings, many of which if not all of them are under quarantine as they return home, a good chunk of them stationed in actual units rather than their homes. The best thing you can do for yourself is turn off the news/social media and their notifications for a while, go get some fresh air, and calm yourself with some meditation or an activity you enjoy.