The risk to the rest of the school and the general public remains "extremely low," AHS said.

A letter was sent home from Evansdale School after a Grade 6 student with a compromised immune system was diagnosed with a rare and potentially deadly diphtheria infection again.

A letter was sent home on Monday to families with students at Evansdale Elementary School in north Edmonton. The letter stated a student at the school had come down with a confirmed case of diphtheria.