“…The first description was made by Leyer and Johnson (1992), who showed that S. Enteritidis, S. Heidelberg and S. Javiana displayed an increased acid tolerance against lactic acid at pH 3.85 after their adaptation to mild acid (pH 5.8) with hydrochloric acid for one doubling, with S. Javiana and S. Enteritidis showing the most marked response. Since then, an ATR has been observed in several occasions for a wide variety of Salmonella enterica serovars (Álvarez-Ordóñez et al, 2009b;Álvarez-Ordóñez et al, 2009c;Arvizu-Medrano & Escartín, 2005;Bacon et al, 2003;Malheiros et al, 2009;Perez et al, 2010;Tiwari et al, 2004;Yuk & Schneider, 2006). Bacon et al (2003) described a low-pH-inducible ATR for S. Agona, S. Anatum, S. Mbandaka, S. Reading and S. Saintpaul after a long-term acid adaptation through bacterial growth in the presence of glucose; however, these authors did not find an ATR following a short-term acid shock at pH 4.3.…”