If you catch this would you lose your medical?
The answer is NO, simply because you would be unlikely to be ill for long enough to warrant being made T/U (temporarily unfit). From the aeromedical certification point of view this recent virus would not be treated any differently to ordinary, so-called "seasonal", flu. As with the latter, you could expect to be off work for a week or two, but the certification authorities would not be interested.
In the light of all the present media hype, if a commercial pilot WERE unlucky enough to get this, then I suspect that going back to work afterwards would quite a palaver ! !