Older people are geting vaccinated, but cases rise among the young.

Rising Covid Case Counts in the Young Test U.S. Vaccine Strategy The U.S. has spent months trying to vaccinate those most at-risk of severe illness from Covid-19, from health-care providers and the elderly, to essential workers and those with other underlying medical conditions. Emma Court Bloomberg.com

The U.S. has spent months trying to vaccinate those most at-risk of severe illness from Covid-19, from health-care providers and the elderly, to essential workers and those with other underlying medical conditions.

In the weeks ahead, data on Covid hospitalizations and deaths will show whether that strategy is working.

Spikes in case numbers have typically translated weeks later to increasing hospitalizations and fatalities, a dynamic that should abate after the most vulnerable are immunized. While there are early signs that’s happening in places like nursing homes, whether it will hold true with other at-risk groups and younger people remains to be seen. And the moment of truth is arriving just as infections are rising again in many states.

“It’ll be a test of the effectiveness of our vaccination campaigns to reach at-risk populations,” said Josh Michaud, an associate director for global health policy at the Kaiser Family Foundation, an independent nonprofit. All states have at least made those age 65 and older eligible, which means “you’re cutting out something like 80% of the population most at risk of dying.”

The expanding share of Americans who have received Covid-19 vaccines -- about 26%, or more than 87 million people, have gotten at least one dose -- represents an inflection point in the pandemic’s trajectory and a watershed moment for the U.S., where the virus has sickened at least 30 million and killed more than 547,000.

Yet most people in the U.S. still aren’t protected. And there are major roadblocks in the U.S. race to stay ahead of the virus, including vaccine hesitancy and barriers to access, declines in testing and the emergence of more-contagious variants.

While the number of new cases, hospitalizations and deaths will remain important indicators of the state of the pandemic, there’s a glaring need for more precise ways of measuring Covid-19, public-health experts say.

“Knowing where we have a problem by community and by source is very important to handle the pandemic as we move forward,” said Ali Mokdad, a professor at the Institute for Health Metrics and Evaluation in Seattle, which produces influential Covid-19 projections. “Otherwise, we are flying blind.” ...

... the Michigan Health & Hospital Association raised alarms this week about hospitalizations spiking among younger age groups: Since early March, they rose 633% among those in their 30s and 800% among those in their 40s. The data show Covid-19 vaccines are working but also “that adults of any age are vulnerable to complications from the disease,” the group said. ...