CLÚSTER DE COLEGIOS MÉDICOS
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a member of a diverse family of enveloped, nonsegmented RNA viruses. The coronavirus genomic RNA is unusually large, the RNA polymerase is error-prone, and mutations accumulate with increasing frequency during infections. With continued uncontrolled transmission and viral replication, mutations that give the […]
Editor’s note: Find the latest COVID-19 news and guidance in Medscape’s Coronavirus Resource Center. Medscape Medical News Editor-in-Chief Eric Topol, MD, founder and director of the Scripps Research Translational Institute and professor of molecular medicine, has been closely following COVID-19 data since the pandemic began. He spoke with writer Miriam E. […]
Summary Emerging variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are of clinical concern. In a cohort of 417 persons who had received the second dose of BNT162b2 (Pfizer–BioNTech) or mRNA-1273 (Moderna) vaccine at least 2 weeks previously, we identified 2 women with vaccine breakthrough infection. Despite evidence of […]
Countries that have reported variants of SARS-CoV-2. A new SARS-CoV-2 variant has one or more mutations that differentiate it from predominant virus variants already circulating among the general population. Variants are expected to occur as viruses are constantly changing. Surveillance can help investigate how some variants may impact COVID-19 disease […]
Public health officials in the Midwest and Northeast are sounding the alarm about steep new increases in COVID-19 cases in children. The increases seem to be driven by greater circulation of more contagious variants, just as children and teens have returned to in-person activities like sports, parties, and classes. “I […]
As the virus that causes COVID-19 continues to evolve, drugmakers are racing to adapt their vaccines to the changes in the virus’ genetic code that appear to help it escape our immune defenses. Of the three “variants of concern” recognized by the World Health Organization and Centers for Disease Control […]
The Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO) have established new criteria to classify variants of SARS-CoV-2, the virus that causes COVID-19. The criteria are meant to clarify how much is known about recent changes to the circulating viruses. The levels also help […]
The unchecked spread of the more contagious SARS-CoV-2 variants in Brazil appears to have created even more dangerous versions of the virus that causes COVID-19. The changes are documented by a team of researchers from FIOCRUZ, a large public health research lab run by Brazil’s Ministry of Health. The findings […]
Across the world, there are multiple variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 (Covid-19). SARS-CoV-2 variants have been classified by the Centers for Disease Control and Prevention (CDC) as variants of interest, variants of concern, and variants of high consequence. Three […]
The Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO) have established new criteria to classify variants of SARS-CoV-2, the virus that causes COVID-19. The criteria are meant to clarify how much is known about recent changes to the circulating viruses. The levels also help convey […]