Role of Immigration in Tuberculosis Transmission to Iran: A Systematic Review

Amir Mohammadzadeh, Jalil Rashedi, Behroz Mahdavi Poor, Hossein Samadi Kafil, Mahya Pourostadi, Abdolhassan Kazemi, Mohammad Asgharzadeh

Abstract


Background: Today, because of increasing immigration and the prevalence of drug‑resistant tuberculosis in Iran, identifying intra‑community cases is necessary in the country. It will be possible through the use of molecular epidemiologic methods. In this inquiry, in order to determine the role of immigrants in the transmission of specific strains to Iran, the studies have been examined which had been conducted based on molecular epidemiologic methods among Iranians and non‑Iranians people.

Methods: All studies from 1997 to the end of March 2017 were examined in three databases of PubMed, Scopus, and Google Scholar and finally, 16 studies were selected.

Results: The common clustering rate between Iranians and non‑Iranians was determined to be 19.8, and the intra‑community recent transmission rate was from 0% to 49% with average of 18.1%. The rate of multidrug‑resistant tuberculosis (MDR‑TB) was 12.5%, which was higher among immigrants, especially Afghans, and a significant number of the strains were Beijing.

Conclusions: The studies have shown that migrants, especially Afghans, are more effective in transmitting specific strains of tuberculosis to migratory areas. To control tuberculosis, it is necessary to register of immigrant’s health information, while enter to the country, so that, by doing appropriate diagnostic tests, the curing the patients, the transmission of tuberculosis to the country would be prevented.


Keywords


: Immigration; Iran; molecular typing; tuberculosis

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