dr. michael osterholm, director, center for infectious disease research & policy at the university of minnesotaank you for joining us. how worried should we, these new reports every day, these new classifications every day of this new virus? >> well, first of all, the fact that there's been a case now documented of sexual transmissions doesn't surprise us. it's already happened before. the question is how often it will occur. and at this point, we don't have any evidence that it's a frequent occurrence, but clearly for those who travel from the united states to one of these affected countries and a male coming back having sex with his female partner, who may either be pregnant or could become pregnant is a concern, and in that sense, that's what we need to be most worried about. >> ifill: how significant is a who call or declaration of emergency in this case? >> well, first of all, to really understand this concept of emergency what, it really does it ist just helps prioritize the kind of resources and the importance to the world that this is. it shouldn't mean that people should panic or that