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Walter H. Haas
Researcher at Heidelberg University
Publications - 12
Citations - 1164
Walter H. Haas is an academic researcher from Heidelberg University. The author has contributed to research in topics: Mycobacterium tuberculosis & Mycobacterium tuberculosis complex. The author has an hindex of 11, co-authored 12 publications receiving 1147 citations. Previous affiliations of Walter H. Haas include Robert Koch Institute.
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Journal ArticleDOI
Comparison of Methods Based on Different Molecular Epidemiological Markers for Typing of Mycobacterium tuberculosis Complex Strains: Interlaboratory Study of Discriminatory Power and Reproducibility
Kristin Kremer,D. van Soolingen,Richard Frothingham,Walter H. Haas,Peter W. M. Hermans,Carlos Martin,Prasit Palittapongarnpim,Bonnie B. Plikaytis,Lee W. Riley,Mitchell A. Yakrus,James M. Musser,J. D. A. Van Embden +11 more
TL;DR: Strain differentiation by IS6110 RFLP or mixed-linker PCR are the methods of choice for epidemiological investigations, indicating a clonal population structure of M. tuberculosis strains.
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Molecular analysis of katG gene mutations in strains of Mycobacterium tuberculosis complex from Africa.
Walter H. Haas,K Schilke,J Brand,Beate Amthor,K Weyer,P.B. Fourie,G Bretzel,V Sticht-Groh,H J Bremer +8 more
TL;DR: A sample of 124 isoniazid (INH)-resistant and 88 susceptible strains of Mycobacterium tuberculosis complex from south, central, and west Africa was analyzed by direct sequence analysis and PCR-restriction fragment length polymorphism analysis of their catalase-peroxidase (katG) genes.
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Nosocomial Outbreak of Tuberculosis in a Renal Transplant Unit: Application of a New Technique for Restriction Fragment Length Polymorphism Analysis of Mycobacterium tuberculosis Isolates
John A. Jereb,Dale R. Burwen,Samuel W. Dooley,Walter H. Haas,Jack T. Crawford,Lawrence Geiter,Michael B. Edmond,John N. Dowling,Ron Shapiro,A. William Pasculle,Sandra L. Shanahan,William R. Jarvis +11 more
TL;DR: In this paper, mycobacterium tuberculosis isolates were compared by restriction fragment length polymorphism (RFLP) by a polymerase chain reaction method, and the median incubation period for TB in RT patients was 7.5 weeks (range, 5-11).
Journal ArticleDOI
Nosocomial Transmission of Mycobacterium tuberculosis: Role of Health Care Workers in Outbreak Propagation
Stephanie Zaza,Henry M. Blumberg,Consuelo M. Beck-Sague,Walter H. Haas,Charles L. Woodley,Maritza Pineda,Christine Parrish,Jack T. Crawford,John E. McGowan,William R. Jarvis +9 more
TL;DR: Underlying conditions and performing charting activities in the nurses' work room were associated with progression to active TB among infected workers and Transmission was facilitated by delayed treatment of workers with skin test conversion or TB symptoms.
Journal ArticleDOI
Comparison of DNA fingerprint patterns of isolates of Mycobacterium africanum from east and west Africa.
Walter H. Haas,G Bretzel,Beate Amthor,K Schilke,G. Krommes,S. Rüsch-Gerdes,V Sticht-Groh,H J Bremer +7 more
TL;DR: The results of DNA fingerprint analysis of strains isolated from patients with pulmonary tuberculosis in Uganda and Sierra Leone support the concept of geographically defined subtypes of M. africanum and demonstrate that natural geographic differences in the variability of IS6110 DNA fingerprints within the M. tuberculosis complex must be considered if this technique is used for epidemiologic studies.