Final answer:
The decrease in rates of sepsis in children in recent years is mainly attributed to higher rates of immunization, which protect children from infectious diseases that can lead to sepsis.
Step-by-step explanation:
Rates of sepsis in children have lowered in recent years mainly because of higher rates of select immunization. Immunizations have become a critical preventive measure in public health, with the ability to protect children from serious contagious diseases. This is evident in diseases such as pertussis where widespread vaccination has noticeably reduced reported cases. The practice of vaccination has also prevented large epidemics and reduced the likelihood of diseases that can contribute to sepsis in children.
By effectively controlling the spread of infectious diseases the incidence of sepsis has decreased as fewer children are exposed to the pathogens that can lead to septic conditions.