Are we prepared for epidemics?

epidemic-mosquito-zika
Mosquitoes can transmit many viruses, such as, Zika, West Nile, dengue, and yellow fever.
Image: Thinkstock

Ask the Doctor

Q. Why is it that we suddenly have epidemics of things like Zika virus that we've never heard about, and that we have no treatments or vaccines for? It feels like we should be better prepared than we apparently are. This worries me more than terrorism.

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