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Volume 19, Number 3—March 2013

Dispatch

Tuberculosis Outbreak in a Primary School, Milan, Italy

Marino Faccini, Luigi Ruffo Codecasa, Giorgio Ciconali, Serafina Cammarata, Catia Rosanna Borriello, Costanza De Gioia, Alessandro Za, Andrea Filippo Marino, Valentina VighiComments to Author , Maurizio Ferrarese, Giovanni Gesu, Ester Mazzola, and Silvana Castaldi
Author affiliations: Author affiliations: Prevention Department ASL Milano, Milan, Italy (M. Faccini, G. Ciconali, S. Cammarata, C.R. Borriello, C. De Gioia); Azienda Ospedaliera Ospedale Niguarda Cà Granda, Milan (L.R. Codecasa, M. Ferrarese, G. Gesu, E. Mazzola); University of Milan Postgraduate School of Public Health, Milan (A. Za, A.F. Marino, V. Vighi, S. Castaldi); Fondazione IRCCS Ca’ Granda Ospedale Maggiore, Milan (S. Castaldi)

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Table

Distribution of prevalence rates of TB and LTBI among current and former students at primary school, Milan, Italy, 2011*

Class No. students No. (%) undergoing TST No. (%) TST positive†
Total no. (%) active TB cases‡
First test Second and third tests Total positive
First year 162 161 (99.4) 3 (1.9) 0 3 (1.9) 1 (0.6)
Second year 174 172 (98.9) 47 (27.3) 3 (1.7) 50 (29.1) 5 (2.9)
Third year 170 170 (100) 11 (6.5) 0 11 (6.5) 0
Fourth year 156 156 (100) 30 (19.2) 3 (1.9) 33 (21.2) 2 (1.3)
Fifth year 151 149 (98.7) 57 (38.3) 2 (1.3) 59 (39.6) 4 (2.7)
Former fifth year§ 156 156 (100) 29 (18.6) ND 29 (18.6) 3 (1.9)
Transferred
20
13 (65)
3 (23.1)
ND
3 (23.1)
0
Total 989 977 (98.8) 180 (18.4) 8 (0.8) 188 (19.2) 15 (1.5)

*Because a delay of 8–10 weeks after exposure is necessary for a positive skin test, follow-up screening was performed for students whose initial test occurred <10 weeks after exposure. TB, tuberculosis; LTBI, latent TB infection; TST, tuberculin skin test; ND, not done because initial screening was >10 weeks after exposure.
†At the first screening, 3 students refused to submit to TST; 11 refused at the second, and 11 at the third.
‡All other infections were LTBI.
§Those who were fifth-year students during the previous school year.

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