Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Social distancing versus early detection and contacts tracing in
  epidemic management   Different countries -- and sometimes different regions within the same
countries -- have adopted different strategies in trying to contain the ongoing
COVID-19 epidemic; these mix in variable parts social confinement, early
detection and contact tracing. In this paper we discuss the different effects
of these ingredients on the epidemic dynamics; the discussion is conducted with
the help of two simple models, i.e. the classical SIR model and the recently
introduced variant (A-SIR, arXiv:2003.08720) which takes into account the
presence of a large set of asymptomatic infectives.

5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin