Based on epidemiologic investigation, no additional groups of persons are recommended to begin prophylaxis at this time.

So far this year, epidemiologic investigations have found no link between any two of the four cases.

Such confusion often occurs in the initial stages of an epidemiologic investigation, particularly in remote areas.

The health ministry announced that it will conduct epidemiologic investigation.

Food histories are the backbone of the epidemiologic investigations.

Additional epidemiologic investigations and laboratory studies are under way.

The epidemiologic investigation to determine how the man acquired the infection is in its early stages.

Beijing public health authorities have initiated an epidemiologic investigation.

In an office building, six workers out of 1,000 with brain cancer would merit an epidemiologic investigation.

Notify local and state public health officials so they can begin an epidemiologic investigation.