The oral polio vaccine – which is no longer given in the US – relies on a live but weakened virus that can actually be passed from person to person.
- Professor of Medicine, University of Virginia
The CDC’s controversial recommendation changes are based on new studies showing that most omicron transmission takes place within five days of the onset of illness.
Aunque las vacunas COVID-19 aprobadas proporcionan efectivamente inmunidad contra el virus, no está claro cuánto durará esa protección.
Alors que les premières vaccinations remontent à plusieurs mois et que le virus de la Covid multiplie les variants, faut-il prévoir une campagne de rappel ? Réponse en 6 points.
Though currently approved COVID-19 vaccines effectively provide immunity against the virus, it’s unclear how long that protection will last.
Vaccination rates for COVID-19 have been lower than desired for herd immunity, or when enough people become immune for new infections to stop. What will life look like without it?
The CDC and FDA said the benefits of the Johnson & Johnson vaccine far outweigh the low risk of developing rare blood clots and lifted a pause on the vaccine’s use. A doctor explains.
The one-dose vaccine developed by Johnson & Johnson is temporarily halted because of potentially serious blood clots seen in six women. An immunologist explains what this means for you.
New CDC guidance permits domestic travel for fully vaccinated individuals, as long as social distancing is respected. International travel guidelines are different.
Es una pregunta que, como inmunólogo, escucho con frecuencia. La evidencia disponible invita a la tranquilidad.
An immunologist explains that you get some protection from the first dose of the mRNA vaccines but you need two to build up strong immunity, particularly to newer coronavirus variants.
So far, most vaccines in the US are mRNA vaccines. These represent a new technology and are likely to take over the vaccine world. But how do they work? What are their weaknesses? Five experts explain.
Millions of vaccinated people have been waiting for guidelines on what they can do safely. The CDC says it’s OK to gather with other vaccinated people, but it’s still best to avoid travel.
With slow vaccine distribution and manufacturing, some people won’t get the second dose on time. But does it matter?
With vaccines forthcoming for most Americans, many groups, including expectant mothers, are wondering if the vaccine is safe for them and their babies. A physician-scientist explains.
Because Pfizer-BioNTech and Moderna vaccines have been developed in record time, many wonder whether companies cut corners or compromised safety.
With COVID-19 cases soaring across the US and worldwide, the need for a vaccine could not be greater. Here’s where we stand on vaccine development, including positive results from Pfizer’s trial.
The president and first lady Melania Trump have both tested positive for the coronavirus. Here’s what the physicians and scientists know about the best treatments for the disease it causes.
Several vaccines are in Phase 3 trials. So when will we know whether any of these will protect against COVID-19?
Por muy sombría que sea la situación con la pandemia que asola el mundo y el creciente número de muertes, hay muchas razones para ser optimistas y confiar en que habrá una vacuna a principios del próximo año.
As grim as things are with the pandemic raging in the US and the mounting death toll, there are many reasons to be optimistic there will be a vaccine by early next year.
Una infección crónica o persistente se mantiene durante meses o incluso años, típicamente escondida en áreas del cuerpo poco accesibles para el sistema inmune.
La medicina está evolucionando rápidamente a medida que comprendemos mejor cómo actúa el virus SARS-CoV-2. Ya se están probando decenas de drogas que puedan ayudar a los pacientes con COVID-19.
Some viruses can hide out in the body and reemerge at later times. Which viruses do this, and can the new coronavirus do this too?
During the last six months, news reports have mentioned dozens of drugs that may be effective against the new coronavirus. Here we lay out the evidence and reveal which ones are proven to work. Or not.
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