It is unclear how many students have tested positive.
Families of the infected students “are working with the appropriate healthcare professionals and Departments of Health,” according to the letter.
The Lovett School, which is in the northwestern part of the city, closed its campus in mid-March. The school is an independent, coeducational day school that serves students kindergarten through 12th grade, according to the website.
Traditional graduation ceremonies were postponed until later in the summer but a drive-through graduation parade was held May 17, according to CNN affiliate WSB.
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SOURCE: CNN, Alta Spells and Hollie Silverman