Despite the increasing concerns, risk assessment
data are insufficient for the development of preventive
interventions for the health care setting in developing
countries. In addition to resource limitations, a
lack of awareness about the HCW’s occupational risk
for M. tuberculosis infection and an assumption that
most HCWs are already infected when they began
employment may also have deterred the initiation of
such assessments. Tuberculin skin testing (TST) of
HCWs, a risk assessment tool integral to TB infection
control programs in many hospitals in the United
States,7 is not routinely practiced in most developing
countries. It is believed that prior vaccination with
bacillus Calmette-Guérin (BCG), which is widely
used in developing countries, may complicate interpretation
of TST results.8,9 Thus, the feasibility of
using TST to monitor M. tuberculosis infection in
HCWs has not been examined fully.
As an initial step in the development of effective
nosocomial TB control measures in a developing
country, a cross-sectional TST survey was conducted
among a group of HCWs in Chiang Rai, northern
Thailand, where there has been a recent resurgence of
Despite the increasing concerns, risk assessment
data are insufficient for the development of preventive
interventions for the health care setting in developing
countries. In addition to resource limitations, a
lack of awareness about the HCW’s occupational risk
for M. tuberculosis infection and an assumption that
most HCWs are already infected when they began
employment may also have deterred the initiation of
such assessments. Tuberculin skin testing (TST) of
HCWs, a risk assessment tool integral to TB infection
control programs in many hospitals in the United
States,7 is not routinely practiced in most developing
countries. It is believed that prior vaccination with
bacillus Calmette-Guérin (BCG), which is widely
used in developing countries, may complicate interpretation
of TST results.8,9 Thus, the feasibility of
using TST to monitor M. tuberculosis infection in
HCWs has not been examined fully.
As an initial step in the development of effective
nosocomial TB control measures in a developing
country, a cross-sectional TST survey was conducted
among a group of HCWs in Chiang Rai, northern
Thailand, where there has been a recent resurgence of
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