Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical Model for Virus Spread   The steady state properties of the mean density population of infected cells
in a viral spread is simulated by a general forest fire like cellular automaton
model with two distinct populations of cells ( permissive and resistant ones)
and studied in the framework of the mean field approximation. Stochastic
dynamical ingredients are introduced in this model to mimic cells regeneration
(with probability {\it p}) and to consider infection processes by other means
than contiguity (with probability {\it f}). Simulations are carried on a $L
\times L$ square lattice considering the eigth first neighbors. The mean
density population of infected cells ($D_i$) is measured as function of the
regeneration probability {\it p}, and analized for small values of the ratio
{\it f/p } and for distinct degrees of the cell resistance. The results
obtained by a mean field like approach recovers the simulations results. The
role of the resistant parameter $R$ ($R \geq 2)$ on the steady state properties
is investigated and discussed in comparision with the $R=1$ monocell case which
corresponds to the {\em self organized critical} forest fire model. The fractal
dimension of the dead cells ulcers contours were also estimated and analised as
function of the model parameters.

33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph