According to the Affordable Care Act, which vaccine must be covered without cost-share?

The Affordable Care Act (ACA) mandates that all health plans must cover routine vaccinations recommended by the Advisory Committee on Immunization Practices (ACIP) without any cost-sharing. This means that patients should not incur any out-of-pocket expenses, such as copayments or deductibles, for these particular vaccines. Routine vaccines include those that are typically administered to the general population, such as vaccines for influenza, measles, mumps, rubella, and others included in the ACIP's schedule.

In contrast, travel vaccines, which may not be considered routine since they are often dependent on individual travel plans and destinations, do not enjoy the same cost-sharing exemption under the ACA. Additionally, vaccines covered under Medicare Part D or those provided by out-of-network providers may have different cost-sharing requirements, which means they would not automatically qualify for coverage without cost-sharing as stipulated by the ACA.

Thus, the correct answer highlights the ACA's goal of enhancing public health by ensuring that essential, routinely recommended vaccinations are accessible without the barrier of cost for the majority of individuals.