Yosemite Virus Potentially Kills 1-in-3 Visitors
news.com.au
news.com.au
The linked article says "Some 10,000 visitors to California's Yosemite National Park could have been exposed to a deadly virus that kills one in three victims and cannot be treated" (Emphasis added.)
I wish people would resist the temptation to change the meaning of the stories they link to, by making up headlines that journalists wouldn't dream of writing.
There is no actual rule like this, but there ought to be -- don't rewrite the article's headline, copy it.