Final answer:
High doses of vaccinations can reduce child mortality in economically poor countries by preventing and treating common diseases.
Step-by-step explanation:
High doses of vaccinations twice per year can reduce overall child mortality in economically poor countries. According to the World Health Organization, the most frequent causes of death for children under five in low-income countries include pneumonia, diarrhea, congenital anomalies, preterm birth complications, birth asphyxia/trauma, and malaria. These diseases can all be prevented or treated with affordable interventions such as immunizations, adequate nutrition, safe water, and quality care by trained health providers.