Remember the major panic about Bird Flu? I get the feeling this could go the same way. I doubt it will stop the grand prix from taking place.
Bird Flu ah yes, can't say I paniced though
And before that, we were all going to die of SARS.
It all reminds me of that sketch about Tomato Flu.
The problem with warnings of flu pandemics etc. is simple. If there's even a 5% chance of a particular strain turning into a pandemic, then it's worthy of warnings and preventative measures. However, if the true likelihood of a pandemic is 5%, then of course we can easily have many such scares without a pandemic. So the general public becomes blase and cynical about the warnings and measures.
The thing with viruses is that whether they spread or die back depends on one thing, whether the number of new cases is higher than the number of cases that cure. Particularly since infections typically follow exponential growth (or a contraction in the number of cases). So, the measures that are being taken, even if quite simple, may actually prevent a pandemic. Perhaps if we'd just sat back and been cynical about SARS, it would have spread around the world and killed millions.
Once thing that this scientists all agree on though is that at some time we will have a flu pandemic, and that a lot of people will die. Probably not this time, but at some time.
Returning to the Spanish GP, if the number of cases continues growing for the next two weeks (and that's a big if) then I wouldn't be surprised to see some minor measures in place. But it could be minor things such as recommendations for more frequent handwashing.