| Fomite: Object or surface contaminated by infected droplets. The contamination can occur through sneezing, coughing on, or touching surfaces 1 |
| Viral load: A measure of the number of viral particles present in an individual 2 |
| Cycle threshold: The number of cycles required for the fluorescent signal to cross the threshold. Ct levels are inversely proportional to the amount of target nucleic acid in the sample 3 |
1World Health Organization. Q&A: How is COVID-19 transmitted? https://www.who.int/vietnam/news/detail/14-07-2020-q-a-how-is-covid-19-transmitted
2 https://www.cebm.net/covid-19/sars-cov-2-viral-load-and-the-severity-of-covid-19/