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A decade ago, Chinese authorities repeatedly said that the SARS epidemic — short for severe acute respiratory syndrome — was under control, despite strong evidence to the contrary.

As it spread, Chinese doctors began to accuse their own government of covering up just how widespread the outbreak had become.

That doesn’t seem to the case with H7N9, Dr. Cox said.

“Our feeling is that we have a really good sense of what’s going on over there in terms of the cases,” she said. “They’re working very, very quickly.”