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Table 1 The classification of core keywords in 1991-2020
ACE2 angiotensin-converting enzyme 2, DPP4 dipeptidyl
peptidase-4, TMPRSS2 transmembrane protease serine 2, SARSsevere acute respiratory syndrome, ORF open reading frame,Nsp non-structural protein, ADAM-17 a disintegrin and
metalloproteinase 17, NK cell Nature Killer cell, NF-kappa
B nuclear factor kappa-light-china-enhancer of activated B cells,TNF tumor necrosis factor, ARDS acute respiratory distress
syndrome, COPD chronic obstructive pulmonary disease, CNScentral nervous system, rRT-PCR real-time reverse
transcriptase-polymerase chain reaction, ELISA enzyme-linked
immunosorbent assay
TP total publications, * author keywords mainly presented in 2020
Fig. 1 Global research outputs of Science Citation Index
Expanded (SCIE),Social Science Citation Index (SSCI) and publications
on coronavirus in 1991-2020
Fig. 2 Distribution changes of global publications in the
coronavirus fields and the reported cases during three human
coronaviruses outbreaks. (a) Distribution of publications in 1991-2002.
(b) Distribution of publications in 2003-2011 and the world reported
cases during the SARS outbreak. (c) Distribution of publications in
2012-2019 and the world reported cases during the MERS outbreak. (d)
Distribution of publications in 2020 and the world reported cases during
the COVID-19 outbreak
Fig. 3 International-collaborative and independent publications
in coronavirus researches
IP independent publications, ICP international-collaborative
publications, ICPP the percentage of international-collaborative
publications
Fig. 4 Collaboration network of the productive countries or
territories
(a) international collaboration in 1991-2019. (b) international
collaboration in 2020