You Can Get Covid Again. Here’s What to Know About Reinfection.

If you’re one of the millions of Americans who have already had Covid-19, you may be wondering how long you will have immunity from the coronavirus. Earlier in the pandemic, most people assumed that getting infected had at least one upside: that you would be protected against future encounters with the virus. But as the […]

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Why Do I Feel Sick Before My Period?

Q: Does a woman’s immune system weaken at certain times of her menstrual cycle? I have always noticed that if I get sick, it’s almost always just before I get my period. Experts say that while there isn’t enough data to prove that you’re more likely to feel sick before or during your period, there […]

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Tener covid es confuso. Este es un plan para superar la enfermedad

La BA.2, una subvariante altamente contagiosa de la variante ómicron, ha causado la preocupación de las autoridades de salud al convertirse en la versión dominante del coronavirus en todo el mundo. Hasta ahora, los indicios apuntan a que la BA.2 es entre un 30 por ciento y un 80 por ciento más transmisible que la […]

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Why a Coronavirus-Flu ‘Twindemic’ May Never Happen

An intriguing theory may help explain why the flu and Covid-19 never gripped the nation simultaneously — the so-called twindemic that many public health experts had feared. The idea is that it wasn’t just masks, social distancing or other pandemic restrictions that caused flu and other respiratory viruses to fade while the coronavirus reigned, and […]

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Should You Get a 4th Covid Shot?

As coronavirus case counts continue to plummet across the United States, people’s immunity may be declining, too. Several studies have found that while mRNA booster shots have been successful at preventing hospitalization and death, their effectiveness against infections is waning. It’s no wonder, then, that late Thursday, Moderna sought emergency use authorization from the Food […]

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How the Coronavirus Steals the Sense of Smell

Few of Covid-19’s peculiarities have piqued as much interest as anosmia, the abrupt loss of smell that has become a well-known hallmark of the disease. Covid patients lose this sense even without a stuffy nose; the loss can make food taste like cardboard and coffee smell noxious, occasionally persisting after other symptoms have resolved. Scientists […]

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Got a Covid Booster? You Probably Won’t Need Another for a Long Time

Memory B cells become increasingly sophisticated over time, and they learn to recognize a diverse set of viral genetic sequences. The longer they have to practice, the broader the range of virus variants they can thwart. Researchers showed last year that the elite school inside of lymph nodes where the B cells train, called the […]

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How Long Covid Exhausts the Body

BRAIN Inflammation and low oxygen levels may cause cognitive problems. LUNGS Early evidence of oxygen limitations. CIRCULATORY SYSTEM Vascular damage and blood clots may trigger fatigue. IMMUNE SYSTEM Autoantibodies or viral remnants may set off a chain reaction. BRAIN Inflammation and low oxygen levels may cause cognitive problems. LUNGS Early evidence of oxygen limitations. CIRCULATORY […]

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Acabo de tener covid. ¿Necesito un refuerzo? ¿Cuándo?

¿Cuándo es el mejor momento para recibir un refuerzo? No hay una regla fija sobre cuándo programar una vacuna de refuerzo después de haber tenido COVID-19. El momento óptimo dependerá de tus circunstancias individuales, incluyendo la gravedad de tu enfermedad, el tiempo transcurrido desde la resolución de los síntomas y el riesgo de volver a […]

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Most of the World’s Vaccines Likely Won’t Prevent Infection From Omicron

A growing body of preliminary research suggests the Covid vaccines used in most of the world offer almost no defense against becoming infected by the highly contagious Omicron variant. All vaccines still seem to provide a significant degree of protection against serious illness from Omicron, which is the most crucial goal. But only the Pfizer […]

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The Coronavirus Attacks Fat Tissue, Scientists Find

From the start of the pandemic, the coronavirus seemed to target people carrying extra pounds. Patients who were overweight or obese were more likely to develop severe Covid-19 and more likely to die. Though these patients often have health conditions like diabetes that compound their risk, scientists have become increasingly convinced that their vulnerability has […]

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Omicron Variant Spreading Twice as Quickly as Delta in South Africa

Underscoring increasing concerns about Omicron, scientists in South Africa said on Friday that the newest coronavirus variant appeared to spread more than twice as quickly as Delta, which had been considered the most contagious version of the virus. Omicron’s rapid spread results from a combination of contagiousness and an ability to dodge the body’s immune […]

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