Worldwide, there is no correlation between a child's gender and immunisation, i.e., there is no gender difference. One important exception is India where females are associated with missed polio vaccination (via).
"(...) there are notable
variations where immunization coverage is higher for girls
in some countries and higher for boys in others. This is why
the polio programme regularly collects sex-disaggregated
data to enable it to track gender-related discrepancies and
take swift corrective action. Overall it is important to note
that data from the polio-endemic countries (Afghanistan,
Nigeria and Pakistan) in the past two years shows that girls
and boys have been equally reached in house-to-house
vaccination campaigns. For instance, in Afghanistan, out of
all girls surveyed after vaccination campaigns in 2017, 92.6%
were recorded as vaccinated, compared to 92.5% of boys.
This high level of coverage is the tangible result of targeted
and context-specific communications for awareness raising
and behaviour change activities, combined with well-trained
health workers recruited from local communities."
Global Polio Eradication Initiative
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