TPSAB1 and anaphylaxis: Notably, rs765144578 variant in the TPSAB1 locus demonstrated the strongest association with cefaclor‐induced anaphylaxis (adjusted p < 0.001; risk allele frequency [RAF] 0.44 vs. 0.05; odds ratio [OR] 98.96; 95% confidence interval [CI], 17.65–555.04).