IL4R and asthma: For example, a mutant allele of rs1800925 on IL13 was associated with emergency room (ER) visits or hospitalizations of Costa Rican children with asthma [5], and those of rs1805011 and rs1801275 on IL4RA were associated with intensive care unit (ICU) care, ER visits or hospitalizations in two cohorts of US adult asthma patients [6].