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

immunize

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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