As countries work to reopen from the pandemic, the spread of the delta variant of COVID-19 is a cause for concern. Meghan Fitzgerald, healthcare policy professor at Columbia University, joined Cheddar to discuss factors that have led to the spread of the variant strain and the dangers it poses for those who have not received vaccinations. "In states where we have vaccine coverage around 30 percent, that is troublesome and worrisome to me," she said. Fitzgerald also talked about data showing the mixing of vaccines as still being effective against the virus.