  While the Macroscopic Fluctuation Theory (MFT) is a renormalized theory in
the hydrodynamic limit based on a space-time local Lagrangian that is Gaussian
with respect to the empirical current, C. Maes, K. Netocny and B. Wynants
[Markov Proc. Rel. Fields. 14, 445 (2008)] have derived a microscopic
Fluctuation Theory (mFT) for independent Markov jump processes based on a
space-time local Lagrangian that is Poissonian with respect to the empirical
flow, in direct relation with the general theory of large deviations at 'Level
2.5' for Markovian processes. Here we describe how this approach can be
generalized to the presence of interactions, that can be either zero-range or
involve neighbors, either for closed systems or for open systems with
reservoirs.
