Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deterministic Critical Community Size For The SIR System and Viral
  Strain Selection   In this paper the concept of Critical Community Size (CCS) for the
deterministic SIR model is introduced and its consequences for the disease
dynamics are stressed. The disease can fade out after an outburst. Also the
principle of competitive exclusion holds no longer true. This is exemplified
for the dynamics of two competing virus strains. The virus with higher R0 can
be eradicated from the population.

30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat