"The United States has made remarkable progress in reducing both teen pregnancy and racial and ethnic..." — Tom Frieden

Pregnant women who are in places where Zika is spreading should do everything they can to avoid mosquito bites. And we, as a society, need to do everything we can to control Zika. That means learning more about it; that means controlling mosquitoes more effectively. That means achieving a vaccine.

Our progress against malaria is impressive. But vigilance remains a critical ingredient to protect the health of all people.

Vaccines and antibiotics have made many infectious diseases a thing of the past; we've come to expect that public health and modern science can conquer all microbes. But nature is a formidable adversary.

The way we work in public health is, we make the best recommendations and decisions based on the best available data.