If in past 15 years 5 times I had documented negative TB skin test zero mm duration and redness, Does this proof I did not have TB?I was told because I came from midleast country that TB is pendemic there I have had TB before my entry to US. is it true?

Hi Anon,

Welcome to EmpowHER. Having Zero MM, is most likely you do not have TB.  Immigrants who have moved from a country with a high TB rate in the past 5 years are considered positive 10MM or higher.  This is not a perfect test. Up to 20% of people infected with the bacteria that cause TB may not have a reaction on the PPD skin test, but that can be due to certain conditions that impair the immune system (cancer, recent chemotherapy, late-stage AIDS) may cause a false-negative test result. 

Here's a link that can help

https://www.empowher.com/condition/tuberculosis

Best,

Daisy