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By last week most Chicago hotels and restaurants had had their food handlers examined, ousted all those infected. But the Chicago health authorities were badly worried by "an unexpected, even startling" number of cases revealed in the answers to its questionnaire. Believing the danger much greater than appreciated by most physicians. President Herman X. Bundesen of Chicago's Board of Health arranged for a nationwide radio broadcast to warn and instruct the country. Some authorities believe that one in every ten or 20 persons harbors dysentery parasites. The disease may recur long after an apparent cure. Applicants for food-handling jobs should be examined several times, required to keep themselves thoroughly clean. Those who have had the disease should be examined once a month for four months, every six months thereafter for the rest of their lives.