The delta variant of COVID-19 is quickly spreading around the U.S., causing a new wave of the pandemic, a sharp uptick in case numbers and some businesses and entities to reimpose mask mandates or add vaccine mandates. Symptoms of COVID-19 may appear two to 14 days after exposure to the virus. Anyone can have mild to severe symptoms. Are the symptoms between delta and previous variants any different? In short, it's not completely clear. Dr. Inci Yildirim, a Yale Medicine pediatric infectious diseases specialist and vaccinologist, said in a Yale Medicine article it seems like "cough and loss of smell are less common," when dealing with the delta variant.