They recently visited Guinea and the Democratic Republic of the Congo in West Africa which are grappling with small outbreaks of the disease.
The milestone comes as Oregon speeds up its vaccination expansion to include more demographic groups, with many frontline workers and people aged 16 to 44 with underlying conditions soon eligible.
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Meanwhile, a committee hears from county commissioners who lament the complexity and confusion in the vaccination rollout and public messaging.
Migrant workers, frontline workers and multi-generational households are among the groups that will become eligible for vaccination sooner than expected.
But the general population may still face delays, as Oregon officials plan to keep allocating doses in a targeted way to reach vulnerable groups.