National “twin study”

doi:10.1136/bmj.39514.423090.80

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Ulf R Dahle, senior scientist

¹Norwegian Institute of Public Health, PO Box 4404 Nydalen, 0403 Oslo, Norway

ulf.dahle{at}fhi.no

Davies and Squire say it’s too soon to conclude on the efficacy of directly observed treatment short courses (DOTS) for treating tuberculosis.1

Norway and Sweden are sociodemographically, politically, and culturally comparable. However, the Norwegian tuberculosis control programme fully complies with the DOTS strategy promoted by the World Health Organization and …