President Joe Biden failed to meet a self-set target of 70% of adults vaccinated by the 4 July holiday weekend. About 68% of Americans aged 18 and older have received at least one shot.
The White House and local governments have turned to both creative solutions and celebrity guest stars in an effort to counter vaccine hesitancy.
Michigan, Ohio and California are among the states offering cash lotteries for residents who get the jab. Pop superstar Olivia Rodrigo made an appearance at the White House this week to promote vaccinations among young people, and Nascar will host a vaccine drive this weekend.
The push for vaccines is now taking on added urgency, as infections increase in every state, driven by a surge in variants. Still, case numbers remain dramatically lower than in winter when they were at the peak.
In Canada, too, vaccine rates have slowed in recent weeks, after a steep upswing beginning in late March. The uptick in vaccines has been met with a steady drop in Covid-19 cases. After a steep third wave this spring, Canada reported around 3,000 infections this week - a low not seen since last summer.
With roughly 80% of eligible Canadians protected by at least one dose, Mr Trudeau said on Thursday that the country expects to begin allowing fully vaccinated US citizens and permanent residents into Canada as of mid-August for non-essential travel, and international travellers in September.
Canada has curbed almost all non-essential travel by foreigners since March 2020. Mr Trudeau has faced growing pressure to show his plans for reopening the US-Canada border.
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