文摘
81.6% of biopsies from symptomatic children were H. pylori positive by PCR. Clarithromycin genotype: 42.3% wild-type, 47.7% resistant and 9.9% heterogeneous. Mutations detected: A2143G (87.5%), A2142G (7.5%) and double A2142C-A2143G (5%) Heterogeneous genotypes showed wild-type genotype plus mutation, A2143G or A2142G