Sá, Marcos Eielson Pinheiro de, et al. “Importance of Staphylococcus Aureus in Bovine Subclinical Mastitis: Presence of Enterotoxins, Shock Syndrome Toxin and Relationship With Somatic Cell Count”. Brazilian Journal of Veterinary Research and Animal Science, vol. 41, no. 5, Oct. 2004, pp. 321-6, https://doi.org/10.1590/S1413-95962004000500005.