Which of the following vaccines is included in the basic immunization package for children?

The rotavirus vaccine is included in the basic immunization package for children because it protects against rotavirus infections, which are a leading cause of severe diarrhea in infants and young children. This vaccine is typically administered in the early months of life, and immunization against rotavirus is crucial to prevent dehydration and related complications that can arise from gastroenteritis.

In contrast, the COVID-19 vaccine, while important, is not part of the standard immunization schedule for young children as established by many health authorities, often focusing on higher-risk groups first. The hepatitis A vaccine is usually recommended but not universally included in the basic childhood immunization series. Lastly, while the seasonal flu vaccine is significant for children, it is typically recommended annually rather than being a foundational vaccine included in the core immunization package.