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The updated protocols will shorten the time needed for quarantine after exposure in two circumstances.
If the student has had no symptoms of the virus for 10 days, they may return to school. The Centers for Disease Control (CDC) estimates that this approach would increase the risk of residual post-quarantine by 1%, with a maximum increase of 10%.
If the student has had no symptoms and has a negative PCR test, which is sent off to a lab for more accurate results, they may return after seven days. The CDC estimates that this approach will increase the risk for residual post-quarantine transmission by 5%, with a maximum increase of 12%.