have been immunizing
Present perfect progressive conjugation of immunize. There are other translations for this conjugation.

immunize

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500+ learners.
Diphtheria is very rare in the United States and Europe, where health officials have been immunizing children against it for decades.
La difteria es muy poco frecuente en EE.UU. y en Europa, donde las autoridades sanitarias llevan décadas vacunando sistemáticamente a los niños contra esta enfermedad.
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