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Gov. Greg Abbott of Texas says he tests negative for coronavirus.

Gov. Greg Abbott of Texas says he tests negative for coronavirus.

Moderna booster will be effective against some variants, trial indicates.

How Moderna’s Vaccine Works

How Pfizer’s Vaccine Works

Antibodies Good. Machine-Made Molecules Better?

After Outbreak on Carrier Roosevelt, Many Have Antibodies

After Outbreak on Carrier Roosevelt, Many Have Antibodies