Additional active tuberculosis cases detected and costs incurred by a second household contact investigation.

In routine contact investigation in Myanmar, basic health staff conduct home visits and symptom screening among household contacts before investigation. We supplemented this with follow-up telephone calls by programme nurses inviting all contacts to be screened. The staff identified 376 contacts, 4 with symptoms, 3 of whom presented, including 1 with tuberculosis (TB). Due to the second intervention, 264 of the remaining 373 contacts received screening and 17 additional cases were detected. The additional cost incurred by the second intervention was 4.3 times higher than that of the conventional method, but TB yield was increased by a factor of 17.