Table 1.

Diagnostic criteria used for pertussis diagnosis in serum samples from 1990 to 2009

ParameterResult for:
19901991199219931994199519961997199819992000200120022003200420052006200720082009
No. of analyses4083894143643753265667966448317835986826331,4241,5141,3531,6911,7211,606
No. of patients3433193363023062714706565556917545465935211,2041,3291,1511,4951,5781,430
No. of positive patients918056546175101978279884645571541251308510894
No. of paired positive samples2325182023154115252626161618573841273224
No. of IgM-positive samples846036173146668144517221224579333373848
No. of IgA- and/or IgG-positive samples2611272124329161971121437972595344
No. diagnosed by rise in IgG titer01131013333375625450
No. diagnosed by clinical data27668434174411862511181572