Efikasi Kandidat Vaksin DNA, pcDNA3.1-rpfD Berdasarkan Time to positivity pertumbuhan Mycobacterium tuberculosis dan Hubungannya dengan Interferon Gamma = Efficacy of the DNA Vaccine Candidate, pcDNA3.1-rpfD Based on Time to Positivity of Mycobacterium tuberculosis Growth and Its Correlation with Gamma Interferon Level