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1999<br />

2001<br />

Percentuale per ciascun sierotipo nella<br />

classe 0-4 anni<br />

10%<br />

B<br />

86%<br />

C<br />

90%<br />

14%<br />

http://www.simi.iss.it/dati.htm<br />

C<br />

B<br />

2000<br />

2002<br />

C<br />

39%<br />

C<br />

17%<br />

B<br />

83%<br />

B<br />

61%

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