Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Co-word analysis by clustering.
| Words | Dimension-1 | Dimension-2 | Cluster |
|---|---|---|---|
| Humans | −0.01 | −0.05 | 1 |
| SARS-CoV-2 | −0.01 | −0.05 | 1 |
| COVID-19 | −0.01 | −0.05 | 1 |
| COVID-19 vaccines | 0.03 | −0.09 | 1 |
| Mutation | −0.02 | −0.08 | 1 |
| Spike glycoprotein, coronavirus | −0.01 | -0.09 | 1 |
| Pandemics | 0.04 | −0.02 | 1 |
| Vaccination | 0 | −0.1 | 1 |
| Adult | −0.08 | 0.21 | 1 |
| Middle aged | −0.18 | 0.14 | 1 |
