WORKING ON A MALARIA VACCINE:

The sign on the wall reads “Emergency Response Procedures for a Mosquito Release.”

Among them are “Do Not Leave the Room or Open Any Doors!!!” and “Do Not Panic!”

Everything in the room is white, including the lab coats and surgical masks — for sterility, yes, but also the better to see a mosquito. Hanging next to the sign, in vivid Coast Guard orange, is the last line of defense, a brace of fly swatters.

But the work is deadly serious.