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Also, tens of thousands of federal workers have requested vaccine exemptions on religious grounds.
In another development, the WHO announced the next phase of a treatment trial, which will test three repurposed drugs across 52 countries.
In the northern Amazon basin where cases are spiking, ICUs in Brazil, Peru, and Colombia are filling up with COVID-19 patients.
Efforts are under way to use PAHO funds to help nations buy vaccine, and the group is advising them on trial participation.
In other updates, measles cases are on the rise in the Americas, but showed another decline in Europe.
The findings add more weight to calls for more broadly protective flu vaccines.
In another development, UK health officials warned travelers about an uptick in cases linked to Mexico, particularly the Riviera Maya coast.
Nearly half of US states are reporting widespread flu activity, up from 10 last week.
US flu activity showed a modest jump last week, with the clinic visits for flu-like illness rising above baseline for the first time this season.
The US flu season is picking up, and 2009 H1N1 is the dominant strain so far.
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