Prognosis
Previous Covid Prevents Delta Infection Better Than Pfizer Shot
- Early data from Israel shows natural immunity wanes with time
- People who recovered from Covid may face lower risk from delta
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People who recovered from a bout of Covid-19 during one of the earlier waves of the pandemic appear to have a lower risk of contracting the delta variant than those who got two doses of the vaccine from Pfizer Inc. and BioNTech SE.
The largest real-world analysis comparing natural immunity -- gained from an earlier infection -- to the protection provided by one of the most potent vaccines currently in use showed that reinfections were much less common. The paper from researchers in Israel contrasts with earlier studies, which showed that immunizations offered better protection than an earlier infection, though those studies were not of the delta variant.