Grade 1 - four to six papules (also considered negative)
* Grade 2 - confluent papules form indurated ring (positive)
* Grade 3 - central filling to form disc (positive)
* Grade 4 - disc >10 mm with or without blistering (strongly positive)

Grades 1 and 2 could result from previous BCG or avian tuberculosis, rather than human TB infection.

Children who were found to have a grade 3 or 4 reaction were referred for X-ray and follow-up.

For

1.Previous
3.Next