As winter approaches, many questions remain unanswered about how COVID-19 will spread during the traditional cold-weather sick season. A vast majority of Americans are vaccinated, but far fewer have had booster shots. The current levels of vaccination and immunity from COVID infections should protect many people from getting so sick that they have to be hospitalized, but new variants circulating are likely to be effective at evading some of our existing immune protections. Inquirer health reporter Jason Laughlin joins Health editor Letitia Stein and a local expert to discuss what to expect from COVID in the coming months, how Philadelphia will be tracking the virus, and what you should know about the virus as the year comes to an end.