RLadyBug is a R package for the analysis of Infectious Diseases using Stochastic Epidemic Models. The package consists of two independent tools to analyse infectious disease surveillance data: 1. Stochastic Susceptible-Exposed-Infectious-Recovered (SEIR) models are treated by the java program LadyBug, i.e. for use of this functionality of the package a java virtual machine has to be installed on your computer. 2. Multivariate temporal counting processes for a fixed set of locations are modeled through additive-multiplicative conditional intensities (fitted by the ’twinSIR’ function). (Source: http://cran.r-project.org/web/packages)