https://en.wikipedia.org/wiki/Marine_viruses
"Viruses are the most abundant biological entity in marine environments. On average there are about ten million of them in one milliliter of seawater."
If enough people get seawater up their nose, it's just a matter of time before there's a crossover event :)
https://www.pbs.org/newshour/health/what-to-know-about-anoth...
> The CDC recommends using boiled, sterile or distilled water.
Flesh eating bacteria? Yeah, no, thanks.
https://www.pbs.org/newshour/health/what-to-know-about-anoth...
Yes of course.
The Wikipedia article says "Most of these viruses are bacteriophages ... Bacteriophages are harmless to plants and animals ... Viruses are the main agents responsible for the rapid destruction of harmful algal blooms"
Likely next to none can infect land mammals. Such viruses would not have a way to replicate to large numbers in seawater, not in land mammals.
Ingesting bacteriophages could even be beneficial if you have bacterial issues.
- Joseph Conrad
https://science.howstuffworks.com/environmental/earth/oceano...
Humpback whale, sure, what with their infamously tiny throats[0]. Killer whale? Probably a different experience.
[0] I was going to link to QI here but that was a blue whale. Same kind of sized throat though.