Pair approximation Binary solutions 1 Communicable Diseases 1 Coordination number 1 Disease Susceptibility 1 Distinguishable pair 1 Distinguishable pairs 1 Epidemic 1 Epidemics 1 Humans 1 Markov chain 1 Mathematical Concepts 1 Modeling parameters 1 Models, Biological 1 Modified quasichemical models 1 Ordered pairs 1 Physical chemistry 1 Quasichemical model 1 SIR 1 Short range ordering 1 Short-range ordering 1 Solution thermodynamics 1 Spatial structure 1 Stochastic Processes 1 Thermodynamics 1 biological model 1 communicable disease 1 disease predisposition 1 epidemic 1 human 1