The World Health Organisation report confirms that the risk of catching COVID-19 from a person who has no symptoms is very low.
Many people with COVID-19 experience only mild symptoms. It is, therefore, possible to catch COVID-19 from someone who has, for example, just a mild cough and does not feel ill. (To access the information click on How does COVID-19 spread?)
The statement by UCSF (University of California, San Francisco) Health Center had stated that it might be possible to catch coronavirus from someone who does not have symptoms. But, the ascertained risk is very low.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.