Dermatitis. 2007;18(2):63-77. Experts have suggested including at least 20 human controls when testing with nonstandardized antigens. The ideal negative control is a patient with a recent history ...

For instance, the Institute d’Elevage (IDELE), which focuses on livestock, claimed in a November report that Brazil continues to use bacitracin and virginiamycin as growth promoters, even though ...