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How does the Delta variant dodge the immune system? Scientists find clues.

Three Studies, One Result: Vaccines Point the Way Out of the Pandemic

Pfizer and Moderna Vaccines Are Likely to Produce Long-Lasting Immunity, Study Suggests

Wondering if the Vaccine Worked? Get the Right Test, at the Right Time

Wondering if the Vaccine Worked? Get the Right Test, at the Right Time

Scientists Report Earliest Known Coronavirus Infections in Five U.S. States

Immunity to the Coronavirus May Persist for Years, Scientists Find

Coronavirus Vaccines Protect Pregnant Women, Another Study Suggests

Vaccines Are Effective Against the New York Variant, Studies Find

Vaccines Won’t Protect Millions of Patients With Weakened Immune Systems

Vaccines Won’t Protect Millions of Patients With Crippled Immune Systems

Blood Clots Linked to AstraZeneca Vaccine Stem From Rare Antibody Reaction

Vaccinated Mothers Are Trying to Give Babies Antibodies via Breast Milk

The Pfizer-BioNTech Vaccine Is Said to Be Powerfully Protective in Adolescents

Virus Variants Likely Evolved Inside People With Weak Immune Systems

A New Coronavirus Variant Is Spreading in New York, Researchers Report

People Who Have Had Covid Should Get Single Vaccine Dose, Studies Suggest

People Who Have Had Covid Should Get Single Vaccine Dose, Studies Suggest

Childhood Colds Do Not Prevent Coronavirus Infection, Study Finds

Coronavirus Variants and Mutations