Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài : New data on African health professionals abroad | Human Resources for Health BioMed Central Open Access New data on African health professionals abroad Michael A Clemens 1 2 and Gunilla Pettersson3 Address 1Center for Global Development 1776 Massachusetts Ave. NW Suite 301 Washington DC 20036 USA 2Public Policy Institute Georgetown University 3520 Prospect St. NW 4th Fl. Washington DC 20007 USA and 3Department of Economics University of Sussex Brighton BN1 9RE UK Email Michael A Clemens - mclemens@ Gunilla Pettersson - Corresponding author Published 10 January 2008 Received 31 January 2007 Human Resources for Health 2008 6 1 doi l478-4491-6-1 Accepted 10 January 2008 This article is available from http content 6 1 1 2008 Clemens and Pettersson licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background The migration of doctors and nurses from Africa to developed countries has raised fears of an African medical brain drain. But empirical research on the causes and effects of the phenomenon has been hampered by a lack of systematic data on the extent of African health workers international movements. Methods We use destination-country census data to estimate the number of African-born doctors and professional nurses working abroad in a developed country circa 2000 and compare this to the stocks of these workers in each country of origin. Results Approximately 65 000 African-born physicians and 70 000 African-born professional nurses were working overseas in a developed country in the year 2000. This represents about one fifth of African-born physicians in the world and about one tenth of African-born professional nurses. The fraction of health professionals abroad varies enormously across .