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Published on: July 19, 2007
Delayed hypersensitivity responses in children after local cutaneous anesthesia
B Björkstén1, B Jung, E B Tågsjö
1Department of Pediatrics, University Hospital, Linköping, Sweden.
Abstract:
The effect of cutaneous analgesia on delayed type hypersensitivity (DTH) reactions as challenged by injections in the skin was assessed by comparing a lidocaine/prilocaine mixture with placebo. Application of 5 g of the mixture 90 min before testing significantly (p less than 0.001) reduced pain but did not influence the DH-reactions as read after 48 hours. Based on these findings, DTH to several antigens were measured in 116 school children, aged 7-15 years. All the children were positive to either tetanus antigen, 7.5 Lf/ml (98% at 48 hours) or mumps test antigen (82%), while positivity to tuberculin 2 TU/ml and candida 1000 PNU/ml were only 11 and 62% respectively. Therefore, DTH tests in an adequately immunized population of children can be limited to two antigens. Application of cutaneous analgesia is recommended as a routine procedure in DTH testing in young children.
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