Earlier this year, researchers said Dallas County would reach herd immunity by the summer. But with the spread of the delta variant of COVID-19, that timeline has changed.
Herd immunity is achieved when enough people are protected from COVID-19, either by prior infection or vaccination, that the virus stops spreading.
Earlier this summer, Dallas County researchers said the county had reached herd immunity -- but that was before the delta variant began to spread.
Now, those researchers say the county will reach herd immunity when 90% of the population has COVID-19 antibodies.
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It's unknown how much antibody protection people with asymptomatic or mild COVID-19 have after they recover.