Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evaluating Incidence and Impact Estimates of the COVID-19 Outbreak from
  Wuhan before Lockdown   Background: Wuhan, China was the epicenter of COVID-19 pandemic. The goal of
current study is to understand the infection transmission dynamics before
intervention measures were taken. Methods: Data and key events were searched
through pubmed and internet. Epidemiological data were calculated using data
extracted from a variety of data sources. Results: We established a timeline
showing by January 1, 2020, Chinese authorities had been presented convincing
evidence of human-to-human transmission; however, it was not until January 20,
2020 that this information was shared with the public. Our study estimated that
there would have been 10989 total infected cases if interventions were taken on
January 2, 2020, versus 239875 cases when lockdown was put in place on January
23, 2020. Conclusions: China's withholding of key information about the 2020
COVID-19 outbreak and its delayed response ultimately led to the largest public
health crisis of this century and could have been avoided with earlier
countermeasures.

19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph