Before revision:  SEMs typically represent counts of individuals in discrete infection states using Markov jump processes ( MJP ), but are computationally challenging as imperfect surveillance, lack of subject-level information, and temporal coarseness of the data obscure the true epidemic.
After revision:  SEMs typically represent counts of individuals in discrete infection states using Markov jump processes ( MJPs ), but are computationally challenging as imperfect surveillance, lack of subject-level information, and temporal coarseness of the data obscure the true epidemic.