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The Delta variant (B.1.617.2) is a highly transmissible variant of the COVID-19 virus that was first detected in India in October 2020. It has mutations in the spike protein that affect its infectivity and immune evasion, and has spread to over 179 countries by November 2021.
Learn about the common and less common symptoms of COVID-19, the disease caused by the SARS-CoV-2 virus. Find out how symptoms vary by variant, age, and time of infection, and how to recognize the emergency signs of the disease.
Deltacoronavirus (Delta-CoV) is one of the four genera (Alpha-, Beta-, Gamma-, and Delta-) of coronaviruses. It is in the subfamily Orthocoronavirinae of the family Coronaviridae. They are enveloped, positive-sense, single-stranded RNA viruses. Deltacoronaviruses infect mostly birds and some mammals.
It is striking unvaccinated populations in many countries and has proven capable of infecting a higher proportion of vaccinated people than its predecessors. Explainer-Beyond Delta, scientists are ...
In California as of July 31, 37% of seniors had received the updated COVID-19 vaccine for the 2023–24 season, as did 18.7% of those age 50 to 64, and 10.1% of the youngest adults.
Learn about the genetic changes and characteristics of different variants of the virus that causes COVID-19, such as Alpha, Beta, Gamma, Delta and Omicron. Find out how they are named, classified, monitored and responded to by the World Health Organization and other sources.
As the Delta variant pushes COVID-19 infection rates higher across the country, a rare consensus seems to be uniting many politicians and pundits across the ideological spectrum.
Learn how COVID-19 is mainly transmitted by respiratory droplets and aerosols, and how it can spread from person to person, surface to person, or animal to human. Find out the factors that affect transmission, such as distance, time, symptoms, and variants.