An Outbreak Involving Extensive Transmission of a Virulent Strain of Mycobacterium tuberculosis
Sarah E. Valway, D.M.D., M.P.H., Maria Pia C. Sanchez, R.N., F.N.P., M.P.H., Thomas F. Shinnick, Ph.D., Ian Orme, Ph.D., Tracy Agerton, B.S.N., M.P.H., Debbie Hoy, B.S.N., M.S.E., J. Scott Jones, B.A., Harriet Westmoreland, R.N., and Ida M. Onorato, M.D.
Background and Methods From 1994 to 1996, there was a largeoutbreak of tuberculosis in a small, rural community with apopulation at low risk for tuberculosis. Twenty-one patientswith tuberculosis (15 with positive cultures) were identified;the DNA fingerprints of the 13 isolates available for testingwere identical. To determine the extent of transmission, weinvestigated both the close and casual contacts of the patients.Using a mouse model, we also studied the virulence of the strainof Mycobacterium tuberculosis that caused the outbreak.
Results The index patient, in whom tuberculosis was diagnosedin 1995; the source patient, in whom the disease was diagnosedin 1994; and a patient in whom the disease was diagnosed in1996 infected the other 18 persons. In five, active diseasedeveloped after only brief, casual exposure. There was extensivetransmission from the three patients to both close and casualcontacts. Of the 429 contacts, 311 (72 percent) had positiveskin tests, including 86 with documented skin-test conversions.Mice infected with the virulent Erdman strain of M. tuberculosishad approximately 1000 bacilli per lung after 10 days and about10,000 bacilli per lung after 20 days. In contrast, mice infectedwith the strain involved in the outbreak had about 10,000 bacilliper lung after 10 days and about 10 million bacilli per lungafter 20 days.
Conclusions In this outbreak of tuberculosis, the growth characteristicsof the strain involved greatly exceeded those of other clinicalisolates of M. tuberculosis. The extensive transmission of tuberculosismay have been due to the increased virulence of the strain ratherthan to environmental factors or patient characteristics.
Source Information
From the Division of Tuberculosis Elimination, National Center for HIV, STD, and TB Prevention (S.E.V., T.A., I.M.O.), Epidemic Intelligence Service, Epidemiology Program Office (M.P.C.S., T.A.), and the Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases (T.F.S.), Centers for Disease Control and Prevention, Atlanta; the Department of Microbiology and Immunology, Colorado State University, Fort Collins (I.O.); the Tennessee Department of Health, Upper Cumberland Region, Cookeville (D.H., H.W.); and Kentucky Department for Health Services, Frankfort (J.S.J.).
Address reprint requests to Dr. Valway at the Division of TB Elimination, Mailstop E-10, Centers for Disease Control and Prevention, 1600 Clifton Rd., Atlanta, GA 30333.
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