ESR1 and infection: Surveillance data from Japan also show that as the incidence of childhood MRMP pneumonia increases, there has also been a gradual rise in the number of patients requiring hospitalization [57]. However, some other studies reported similar fever durations and no differences in clinical symptoms, laboratory tests such as leukocyte count, CRP, or ESR, and imaging findings between MRMP and MSMP infections [56, 58].