One month after her son Eran had recovered from a mild case of COVID-19, Sara Bittan rushed the 3-year-old to the emergency room. He had a high fever, a rash, his eyes and lower body were swollen and red, his stomach was hurting and he was crying in pain.

Eventually diagnosed with the rare multisystem inflammatory syndrome in children (MIS-C), also known as pediatric inflammatory multisystem syndrome (PIMS), Eran was hospitalized in October for a week and has fully recovered, Bittan said.

"It is important for me to tell parents, mothers, all over the world that there is a risk. They should know," said Bittan. "He suffered a lot and I suffered with him."