In Los Angeles, Breakthrough Infections Are Now 30% Of All New Covid Cases Amid Delta Surge

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3. Two significant statements in this article

Overall, however, the percentages of vaccinated people who test positive, are hospitalized or die from Covid remain low — all less than 1%.

And

Ferrer noted today that between April and mid-August, roughly 25% of the Covid-positive patients in L.A. were actually hospitalized for a reason other than the coronavirus. Their infection was detected only during a routine admission screening.

So, the vaccines are working well to prevent serious illness or death, and a large number of breakthrough cases are so mild as to be asymptomatic.