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F.D.A. to Authorize Third Vaccine Dose for People With Weak Immune Systems

12 Aug 2021

The decision to expand the emergency use of both the Pfizer-BioNTech and Moderna vaccines is meant to help transplant recipients and others whose immune systems are similarly compromised.

Most children recover quickly from Covid, but some have lingering symptoms, a study says.

04 Aug 2021

Most children with Covid-19 recover within a week, but a small percentage experience long-term symptoms, according to a new study of more than 1,700 British children. The researchers found that 4.4 percent of children had symptoms that last four weeks or longer, while 1.8 percent have symptoms that last for eight weeks or longer.

‘The war has changed’: Internal CDC document urges new messaging, warns delta infections likely more severe

30 Jul 2021

The delta variant of the coronavirus appears to cause more severe illness than earlier variants and spreads as easily as chickenpox, according to an internal federal health document that argues officials must “acknowledge the war has changed.” The document is an internal Centers for Disease Control and Prevention slide presentation, shared within the CDC and obtained by The Washington Post. It captures the struggle of the nation’s top public health agency to persuade the public to embrace vaccination and prevention measures, including mask-wearing, as cases surge across the United States and new research suggests vaccinated people can spread the virus.

Vaccine mandates are controversial. They’re also an effective way to save lives.

23 Jul 2021

How to save lives Vaccine mandates are controversial. They’re also effective. Before Houston Methodist became one of the first hospital systems in the U.S. to mandate Covid-19 vaccines, about 85 percent of its employees were vaccinated. After the mandate, the share rose to about 98 percent, with the remaining 2 percent receiving exemptions for medical or religious reasons, Bloomberg’s Carey Goldberg reported. Only about 0.6 percent of employees quit or were fired.

F.D.A. Attaches Warning of Rare Nerve Syndrome to Johnson & Johnson Vaccine

13 Jul 2021

The Food and Drug Administration warned on Monday that Johnson & Johnson’s coronavirus vaccine can lead to an increased risk of a rare neurological condition known as Guillain-Barré syndrome, another setback for a vaccine that has largely been sidelined in the United States.

Variants of SARS-CoV-2

13 Aug 2021

When a virus develops a new mutation, it is called a variant of the original virus. As viruses spread, they constantly change through mutations to their genetic code. Most mutations in the SARS-CoV-2 genome do not affect the functioning of the virus. However, mutations in the spike protein of SARS-CoV-2, which binds to receptors on cells lining the inside of the human nose, may make the virus easier to spread or affect how well vaccines protect people. Other mutations may lead to SARS-CoV-2 being less responsive to treatments for COVID-19.

Randomized Trial of a Third Dose of mRNA-1273 Vaccine in Transplant Recipients

11 Aug 2021

In organ-transplant recipients, the standard two-dose vaccination strategy for coronavirus disease 2019 (Covid-19) has suboptimal immunogenicity.1 Both patients and health care providers have questioned whether a third-dose booster in transplant recipients would be safe and enhance immune response.2 We performed a double-blind, randomized, controlled trial of a third dose of mRNA-1273 vaccine (Moderna) as compared with placebo (the protocol is available with the full text of this letter at NEJM.org; ClinicalTrials.gov number, NCT04885907. opens in new tab).

Long-term Symptoms After SARS-CoV-2 Infection in Children and Adolescents

15 Jul 2021

Children can experience SARS-CoV-2 postviral syndromes, but it is unclear to what extent these individuals are affected by long COVID. Evidence is predominantly limited to select populations without control groups,1-4 which does not allow estimating the overall prevalence and burden in a general pediatric population. We compared symptoms compatible with long COVID in children and adolescents (hereafter “children”) reported within 6 months after SARS-CoV-2 serologic testing.

Study Suggests Lasting Immunity After COVID-19, With a Big Boost From Vaccination

14 Jul 2021

After an infection with SARS-CoV-2, most people—even those with mild infections—appear to have some protection against the virus for at least a year, a recent follow-up study of recovered patients published in Nature suggests. What’s more, this and other research demonstrates that vaccinating these individuals substantially enhances their immune response and confers strong resistance against variants of concern, including the B.1.617.2 (delta) variant.

Return to Play After COVID-19 Infection in Children

28 Jun 2021

As the pandemic continues, children may experience long-term effects from COVID-19 infections. Because children may become “long haulers” or develop multisystem inflammatory syndrome in children (MIS-C), close monitoring after a COVID-19 diagnosis is important. In addition, children who are athletes require a separate return-to-play evaluation before they return to competitive sports or physical activities.