“…It can be assumed that the individual who became positive on the second test entered the institution in that condition. The two-step tuberculin test has been widely recommended wherever surveillance is important enough to warrant periodic tuberculin testing (Finucane, 1988;Barry, Regan, & Kunches, 1987;Burstin, Muspratt, & Rossing, 1986;Chaparas, Vandiviere, & Melvin, 1985;Kearns, Cole, & Farer, 1985; "The tuberculin skin test," 1981; Comstock & Woolpert, 1978).…”