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Main
CHARACTERISTICS OF TB FOCAL POINTS AND ANALYSIS OF THEIR GEOGRAPHICAL DISTRIBUTION TO ESTIMATE POPULATION SUBJECT TO CHEST X-RAY TESTING Print
Tuesday, 01 August 2017

DOI: 10.21045/2071-5021-2017-56-4-8

Tsybikova E.B.1, Zubova N.A.2, Midorenko D.A.3
1
Federal Research Institute for Health Organization and Informatics of Ministry of Public Health of Russian Federation, Moscow
2 Regional TB dispensary, Saransk
3 Tver State University, Tver

Contacts: Erzheni B. Tsybikova, e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Information about authors:
Tsybikova E.B., http://orcid.org/0000-0002-9131-3584
Zubova N.A., http://orcid.org/0000-0002-1223-4141
Midorenko D.A., http://orcid.org/0000-0002-6056-1745
Acknowledgments. The study had no sponsorship.
Conflct of interests. The authors declare no conflict of interest.

Abstract.

Background. Timely detection of TB among contacts of TB sputum smear-positive patients requires testing not only close and long-term contacts but people living near TB infection focal points and people at high risk for TB due to accidental contacts with TB focal points.

The study purpose: to analyze geographical distribution and boundaries of TB focal points to estimate population subject to X-ray testing (exemplified by Saransk).

Materials and methods: data on 34 patients with sputum smear-positive chronic pulmonary tuberculosis under follow-up at the Regional TB dispensary in Saransk and data on 198 newly diagnosed patients with lung TB in 2014-2015.

Data were extracted from the Rosstat (Federal State Statistics Service) reporting forms #8 and #33 and from the Order #50 of the Ministry of Health of the Russian Federation. For each patient information about sex, age, date of birth and residence address (street and house number) was obtained. Data on Saransk population number and density, and housing in each district of Saransk were also used for the analysis.

Results. Currently, the main source of TB infection in Mordovia is patients with chronic lung TB with unclosed cavities and bacterial excretion after treatment.

Using cartographic methods based on geo-information systems allowed to extend definition of TB focal point to include both actual place of residence of patients with chronic lung TB as well as ambient environment within boundaries of which infection spreads via accidental contacts of the infection source with population.

Comparison of addresses of permanent residence of patients with chronic lung TB with addresses of newly diagnosed TB patients during two years showed that newly diagnosed TB patients lived in the vicinity of chronic TB focal points including buffer zones.

Using cartographic methods based on geo-informational systems allowed to identify location and boundaries of chronic TB focal points helping to estimate population subject to chest X-ray testing due to high risk for TB.

The analysis showed that 11952 people or 10% of the population residing within the area covering the three epidemic clusters and one large epidemic focus required a compulsory chest X-ray testing.

Keywords: chest X-ray testing; lung TB; TB focal points; cartographic method based on geo-information system.

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