Three imported cases of measles were detected in 2011, so the issue of surveillance with epidemiological alerts intensified. The aim of this article is to describe the phenomenon of intensified surveillance of febrile rash illness before the import of confirmed measles in the country at the Mexican Institute of Social Security cases. The cases of epidemiological surveillance system 2011 were obtained was compared with the prior year It was determined t-Student mean difference and Wilson test

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... proportions, both with an alpha value of 0.05. 2786 cases of febrile rash illness were reported, 51.2 % more cases than the previous year were reported in 2011, the number of reported cases in relation to the expected increase in 29 of the 35 Delegations, an increase in the average number of cases reported from week 26. 67.4 % of reported cases are concentrated in children under 5 years of age. The average days to collect laboratory sample improved after issuing alerts from 3.4 to 2.6 days (p < 0.000000559). A significant increase in reported cases of febrile rash illness compared with the prior year was appreciated. The Institute has a surveillance system for robust and febrile rash illness, which has identified risks to the population.