Frieden said three people who may have made direct contact with Vinson have been identified and are being actively monitored.
She said she did not know whether the company actively monitored the F.D.A. database that collects reports about such incidents.
It must also persuade consumers living in free societies to use a social network actively monitored by an authoritarian regime.
But to many, the idea of having your diet, exercise regime, productivity and efficiency at various tasks actively monitored by your employer will be a disturbing one.
Relatively few of the UK's 54 million current account holders actively monitored the relative competitiveness of their current accounts, it said.
A man who had contact with Pham before she became symptomatic is being "actively monitored" by health officials, as is her dog, Texas health commissioner David Lakey said on Tuesday.
It'll also be interesting to see if WeChat can crack western markets by, in the words of the Economist, persuading "consumers living in free societies to use a social network actively monitored by an authoritarian regime".
Out of the more than one million Canadian Muslims, only a handful have committed terrorist acts, and fewer than a hundred people are being actively monitored by Canadian authorities as likely to join in terrorist activities abroad.
But Mr Stein explained that monetary policy can be a useful supplement to regulatory measures precisely because those can only be applied to areas of the financial system that are being actively monitored by regulators.
Others are actively monitored, he said, but by people who have been staring at the screen so long they have lost focus — what you might call the airport baggage screener problem.
That's why many researchers are studying crystals from eruptions of actively monitored volcanoes.
