Table 2.
Highly frequent keywords in 13,518 papers
| No. | Keyword | Occurrences | No | Keyword | Occurrences |
|---|---|---|---|---|---|
| 1 | Respiratory disease | 2630 | 16 | Antibody | 762 |
| 2 | Spike | 1429 | 17 | Enteritis | 733 |
| 3 | Cats | 1349 | 18 | Emerging | 706 |
| 4 | Human | 1334 | 19 | AR-PCR | 701 |
| 5 | Pathogen | 1329 | 20 | Receptor | 695 |
| 6 | PCR | 1238 | 21 | Protease | 677 |
| 7 | RNA | 1215 | 22 | Response | 661 |
| 8 | E-protein | 1165 | 23 | Pneumonia | 619 |
| 9 | Diarrhea | 995 | 24 | Control | 606 |
| 10 | Middle East | 920 | 25 | Influenza | 598 |
| 11 | Spike protein | 888 | 26 | Replication | 596 |
| 12 | Epidemic | 843 | 27 | Vaccines | 585 |
| 13 | Antivirals | 830 | 28 | Nucleocapsid | 584 |
| 14 | Epidemiology | 791 | 29 | Recombinant | 549 |
| 15 | Respiratory tract | 780 | 30 | Diagnosis | 526 |