Eight people were hospitalized, including two 19-year-olds in critical condition.
Six people, including five children, were hospitalized, but none died.
He said about 10 people still were hospitalized in critical condition.
No one had died, but at least 20 people were hospitalized.
More than 450 people are currently hospitalized with the illness.
Some 330,000 people a year are hospitalized because of the disease.
More than 542 people had been hospitalized by this evening, including 24 in critical condition.
"But because so many people are hospitalized each year, the number of patients involved is not insignificant."
There have been no new cases for 20 days although around 200 people are still hospitalized with the disease.
She said another 135 people wounded in the attack had been hospitalized.