OBJECTIVESTo evaluate the effectiveness of the mRNA-1273 vaccine against SARS-CoV-2 variants and assess its effectiveness against the delta variant by time since vaccination. DESIGNTest negative ...

(NEXSTAR) – When the omicron variant emerged, it immediately made its presence known, spreading like wildfire and driving the United States’ largest coronavirus case spike yet. In 2023, the ...

The Delta variant of Covid-19 is more contagious than other lineages, and is spreading rapidly in under-vaccinated populations. While vaccination is a matter of choice for adults, many children -- ...

The coronavirus has come a long way since 2020. While the days of sanitizing Amazon packages and standing six feet apart may feel like they’re behind us (and they very well may be), the SARS-Co-V-2 ...

Scientists hoped that, following vaccination, populations would develop herd immunity to SARS -CoV-2, reducing the risk of infection, even for people without antibodies against the virus. However, the ...

WASHINGTON - In a press briefing Friday, the head of the WHO said the delta variant is "quickly becoming the dominant strain in many countries," and thus, the world is in a "very dangerous period" of ...

Part of the problem is low vaccination rates, experts said. The Centers for Disease Control and Prevention assigned two federal "surge team" members to Missouri this week to help fight the state's ...

Some patients "don't think COVID is real," one health care worker told ABC News. Health care workers in southwest Missouri are sounding the alarm over a wave of young, unvaccinated COVID-19 patients ...