@article{sousa_pompeu_araujo filho_queiroz_ferreira_2006,  title={Purified Protein Derivative - PPD},  volume={10},  ISSN={1413-8670},  url={https://doi.org/10.1590/S1413-86702006000600015},  DOI={10.1590/S1413-86702006000600015},  number={6},  journal={Brazilian Journal of Infectious Diseases},  publisher={Brazilian Society of Infectious Diseases},  author={Sousa, Anastácio Q. and Pompeu, Margarida M.L. and Araujo Filho, C. Jaime and Queiroz, Telma R.B.S. and Ferreira, J. Clementino},  year={2006},  month={Dec},  pages={420–420} }