Extensive Transmission of Mycobacterium tuberculosis from a Child
Amy B. Curtis, Ph.D., M.P.H., Renée Ridzon, M.D., Ruth Vogel, B.S., Stephen McDonough, M.D., James Hargreaves, D.O., Julie Ferry, R.N., B.S.N., Sarah Valway, D.M.D., M.P.H., and Ida M. Onorato, M.D.
Background and Methods Young children rarely transmit tuberculosis.In July 1998, infectious tuberculosis was identified in a nine-year-oldboy in North Dakota who was screened because extrapulmonarytuberculosis had been diagnosed in his female guardian. Thechild, who had come from the Republic of the Marshall Islandsin 1996, had bilateral cavitary tuberculosis. Because he wasthe only known possible source for his female guardian's tuberculosis,an investigation of the child's contacts was undertaken. Weidentified family, school, day-care, and other social contactsand notified these people of their exposure. We asked the contactsto complete a questionnaire and performed tuberculin skin tests.
Results Of the 276 contacts of the child whom we tested, 56(20 percent) had a positive tuberculin skin test (indurationof at least 10 mm), including 3 of the child's 4 household members,16 of his 24 classroom contacts, 10 of 32 school-bus riders,and 9 of 61 day-care contacts. A total of 118 persons receivedpreventive therapy, including 56 young children who were prescribedpreventive therapy until skin tests performed at least 12 weeksafter exposure were negative. The one additional case identifiedwas in the twin brother of the nine-year-old patient. The twinwas not considered infectious on the basis of a sputum smearthat was negative on microscopical examination.
Conclusions This investigation shows that a young child cantransmit Mycobacterium tuberculosis to a large number of contacts.Children with tuberculosis, especially cavitary or laryngealtuberculosis, should be considered potentially infectious, andscreening of their contacts for infection with M. tuberculosisor active tuberculosis may be required.
Source Information
From the Epidemic Intelligence Service, Epidemiology Program Office (A.B.C.), and the Division of Tuberculosis Elimination, National Center for HIV, STD, and TB Prevention (A.B.C., R.R., S.V., I.M.O.), Centers for Disease Control and Prevention, Atlanta; the North Dakota Department of Health, Bismarck (R.V., S.M.); Altru Health Care Systems, Grand Forks, N.D. (J.H.); and the NelsonGriggs District Health Unit, McVille, N.D. (J.F.).
Address reprint requests to Dr. Curtis at the Division of Tuberculosis Elimination, Mailstop E-10, Centers for Disease Control and Prevention, 1600 Clifton Rd., Atlanta, GA 30333.
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