In the Old San Juan district, tourists pour out of cruise ships to shop and take in the sights. Officials worry they could start to see a decline in tourists due to the rising number of Zika cases.
Rather than sweeping reform, Clinton's health plan is a collection of tweaks to the Affordable Care Act. The proposed changes are aimed at trimming consumer costs and improving coverage.
With Zika spreading in Puerto Rico, the government has forbidden stores from raising prices on mosquito repellent, window screens, larvicides and condoms.
Left-leaning economists and Democratic analysts are sparring over Sanders' proposal of health care for all, paid for by the government. Some who like his aspiration say the numbers don't add up.
Fewer people are having strokes now than decades ago. But that improvement seems to be mostly among the elderly. Young people are actually having more strokes, partly because of the rise in obesity.
U.S. disease detectives are launching a research project that health authorities hope will produce the most definitive evidence yet about whether the virus is really causing birth defects.
Estrogen supplements have been linked to cancer risk, but vaginal estrogen is probably safe for women who have had breast cancer, a national gynecologists's group says. It can help with side effects.
Author Sonia Shah says that urbanization and air travel put the global population at an increased risk for disease. "Zika is a great example of how new pathogens are emerging today," she says.