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Dr. Hasan Gokal is now suing Harris County and Harris County Public Health for $1 million.
But the researchers stressed that all three vaccines, including the Pfizer and Johnson & Johnson shots, provide strong protection against people getting so sick that they end up in the hospital.
The company said a Food and Drug Administration review concluded the shots remain safe and effective for at least 4 1/2 months. State officials had warned that many unused doses would expire soon.
How the chaotic system for distributing the world's vaccine supply is wreaking havoc in places that can least afford it.