How does COVID-19 trigger a loss of smell and other olfactory disorders?

How does COVID-19 trigger a loss of smell and other olfactory disorders? | Gavi, the Vaccine Alliance https://www.gavi.org/vaccineswork/how-does-covid-19-trigger-loss-smell-and-other-olfactory-disorders?fbclid=IwAR2JcuRbHMcr6JfPVP3CsftZ4DDMXDE57HreZdImC-B5aKRIj7tcBKHFraM