One way to speed up the testing of a new vaccine is to deliberately expose volunteers to the coronavirus and see if they develop immunity. But the practice raises ethical questions among medics.
Researchers are racing to develop quick, home-based tests for the virus that could deliver test results in minutes. None do that yet, but several under development hold promise, scientists say.
A lot of vaccines and some medications need to be delivered by injection. Two groups of researchers are designing ways of delivering these medications by putting them in pill form.