Table 1 Socio-demographic characteristics of patients

Ethnic origin

• Caucasian

• Asian

• Hispanic

• Black

Socioeconomic status

• Asylum seekers

• Political refugees

• Illegal status

• Homeless

Immunosuppression

• Co-infection with HIV

   CD4 lymphocyte count (/mm³)

   ◦ > 500

   ◦ 200 - 500

   ◦ 50 - 200

   ◦ < 50

• Immunosuppressive treatment

Substance abuse

• Active smokers

• Alcohol abuse

• Drug abuse

Prior TB