the potential misery if/when this truly breaks out in India, Pakistan, Bangladesh
or Sub-Saharan Africa
on top of whatever else people there may be dealing with
and very likely the countries that normally send aid will have their own problems (besides China, maybe, and even they can't help everything I'd think)
From what I've heard, the virus doesn't do well in warm temperatures, so hopefully tropical and sub-tropical countries will be spared the worst of it.