Early evidence is showing that for most people, at least those that are vaccinated, omicron appears to result in mild illness that closely resembles the common cold.  Most prominent symptoms are:

The time it takes for an infected person to develop symptoms after an exposure may be shorter for Omicron than previous variants – this is down from a full week to as little as 2-3 days or fewer.  The best way to prevent ill ness is to avoid being exposed to this virus if possible.  Things that you can do to prepare for Omicron COVID-19: