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COVID-19 Reinfections 

Practice Essentials The definition of COVID-19 reinfection has evolved since early 2021. Fundamentally, it describes an infected individual who has been fully vaccinated, with or without a booster or boosters, and becomes infected with COVID-19 again. The CDC more precisely defines it as COVID-19 infection of a given person with […]

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Monkeypox Outbreak Marked by Unconventional Spread, Clinical Features

When Esther Freeman, MD, PhD, thinks back on what she learned about monkeypox during her training as a dermatologist and an infectious disease epidemiologist, it was widely considered a viral disease with rare outbreaks limited primarily to Central and Western Africa. Dr Esther Freeman “Monkeypox is something we have traditionally only […]

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Updated US Infection- and Vaccine-Induced SARS-CoV-2 Seroprevalence Estimates Based on Blood Donations, July 2020-December 2021

By testing for both SARS-CoV-2 spike and nucleocapsid antibodies, seroprevalence studies can estimate the proportion of a population with antibodies from previous infection (nucleocapsid antibody or infection-induced seroprevalence) and from infection or vaccination (spike antibody or combined infection- and vaccine-induced seroprevalence). US seroprevalence from July 2020 to May 2021 based […]

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COVID-19 en México: Especialista alerta que 12 estados presentan repuntes significativos

México está cerrando su ciclo epidémico y transitando al estado endémico de la pandemia de COVID-19, aseguró a finales de abril de este año el subsecretario de Salud, Hugo López-Gatell. Sin embargo, ya son 12 entidades federativas que presentan repuntes significativos, de acuerdo con Arturo Erdély, actuario y doctor en Ciencias matemáticas por la UNAM. Arturo Erdély, quien se ha dedicado al análisis estadístico de la […]

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“Battle Of Omicron” Being Won By New BA.4 And BA.5 Variants As Overlapping Covid Waves Hit U.S.

Estimates released by the Centers for Disease Control and Prevention today indicate that the share of cases tied to Omicron variants BA.4 and BA.5 increased 79% in the past week. That means, even as the more transmissible BA.2.12.1 Omicron subvariant became officially dominant in the U.S. last week, it’s already being pushed out by newcomers BA.4 and BA.5. The […]

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Moderna says new trial results show that a revised vaccine works better against Omicron.

A significantly stronger immune response against Omicron is seen, but it remains unclear how an updated vaccine will fare against future versions of the virus. Moderna released preliminary results on Wednesday on an updated coronavirus vaccine that targets the Omicron variant, calling it “our lead candidate” to serve as a U.S. booster […]

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