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Jornal de Pediatria
On-line version ISSN 1678-4782
FORTE, Wilma Carvalho Neves et al. Positive skin test and age. J. Pediatr. (Rio J.) [online]. 2001, vol.77, n.2, pp. 112-118. ISSN 1678-4782. http://dx.doi.org/10.1590/S0021-75572001000200011.
OBJECTIVE: to evaluate positive responses to skin tests for immediate hypersensitivity to allergens in children with asthma and rhinitis at different ages. METHOD: we observed positive skin test reactivity in prick tests using fifteen allergens of same origin (total dust and Dermatophagoides sp.; Dermatophagoides pteronyssinus; Dermatophagoides farinae; Blomia tropicalis; Penicillium sp; Alternaria alternata; Cladosporium herbarium; Aspergillus fumigatus; Bermuda grass; forage grass; dog and cat epithelia; feathers; Blatella germanica and wool). We placed 713 selected patients into different age groups - Group I: 6 to 11 months; Group II: 1 to 3 years and 11 months; Group III: 4 to 8 years and 11 months; and Group IV: 9 to 15 years. We used the chi-square test for statistical analysis. RESULTS: the total significant differences between these groups were: I to II = 5; II to III = 5; II to IV = 5; III to IV = 6; I to III = 10; and I to IV = 10. CONCLUSIONS: skin test reactivity is acquired progressively with age, and can be observed as early as at 12 months. Reactivity is significantly more positive from the age of 4 on.
Keywords : immediate hypersensitivity; skin tests; allergens; age groups.