Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: COVID-19 in low-tolerance border quarantine systems: impact of the Delta
  variant of SARS-CoV-2   In controlling transmission of COVID-19, the effectiveness of border
quarantine strategies is a key concern for jurisdictions in which the local
prevalence of disease and immunity is low. In settings like this such as China,
Australia, and New Zealand, rare outbreak events can lead to escalating
epidemics and trigger the imposition of large scale lockdown policies. Here, we
examine to what degree vaccination status of incoming arrivals and the
quarantine workforce can allow relaxation of quarantine requirements. To do so,
we develop and apply a detailed model of COVID-19 disease progression and
transmission taking into account nuanced timing factors. Key among these are
disease incubation periods and the progression of infection detectability
during incubation. Using the disease characteristics associated with the
ancestral lineage of SARS-CoV-2 to benchmark the level of acceptable risk, we
examine the performance of the border quarantine system for vaccinated
arrivals. We examine disease transmission and vaccine efficacy parameters over
a wide range, covering plausible values for the Delta variant currently
circulating globally. Our results indicate a threshold in outbreak potential as
a function of vaccine efficacy, with the time until an outbreak increasing by
up to two orders of magnitude as vaccine efficacy against transmission
increases from 70% to 90%. For parameters corresponding to the Delta variant,
vaccination is able to maintain the capacity of quarantine systems to reduce
case importation and outbreak risk, by counteracting the pathogen's increased
infectiousness. To prevent outbreaks, heightened vaccination in border
quarantine systems must be combined with mass vaccination. The ultimate success
of these programs will depend sensitively on the efficacy of vaccines against
viral transmission.

19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom