The US government will not give the flu vaccine to migrant families being held in detention centers near the US-Mexico border. Customs and Border Protection (CBP) announced the decision Tuesday, weeks before the flu season begins.

“In general, due to the short term nature of CBP holding, the time the vaccine takes to begin working, and the complexities of operating vaccination programs, neither CBP nor its medical contractors administer vaccinations to those in our custody,” a CBP spokesman said in a statement to CBS News. The spokesman did not respond to further questions about the policy.

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