The Standard Operating Procedure for Multiple-Locus Variable-number tandem repeat Analysis (MLVA) typing of Salmonella Typhimurium is described in Annex D of the following report:
Jacobs, W., Kuiling, S., and van der Zwaluw, K., 2014. Molecular typing of Salmonella strains isolated from food, feed and animals: state of play and standard operating procedures for pulsed field gel electrophoresis (PFGE) and Multiple-Locus Variable number tandem repeat Analysis (MLVA) typing, profiles interpretation and curation. EFSA supporting publication 2014: EN-703, 74 pp. http://www.efsa.europa.eu/en/supporting/pub/703e.htm(externe link)

For the Standard Operating Procedure for MLVA typing of Salmonella Enteritidis, reference is made to the procedure published by  ECDC European Centre for Disease Prevention and Control (European Centre for Disease Prevention and Control)(European Centre for Disease Prevention and Control ):
European Centre for Disease Prevention and Control. Laboratory standard operating procedure for multiple-locus variable-number tandem repeat analysis of Salmonella enterica serotype Enteritidis. Stockholm: ECDC; 2016. doi 10.2900/973540 [link]