After years of push back, the first batch of Oxitec’s engineered mosquitoes, designed to reduce population numbers, have been released in the Keys.

There have been no reports of health or environmental harm in other locations where genetically modified mosquitoes have been introduced over the last decade.

Scientists are taking their own vaccines, an ethically murky practice that has a long and sometimes celebrated history in medicine.

According to the World Health Organization, relatively low vaccination coverage in the state of Minas Gerais “could favor the rapid spread of the disease.”