Those suffering from post-acute sequelae of COVID-19 frequently have difficulty concentrating and memory problems, sometimes called “brain fog.” This impairment is a common symptom in those with severe fatigue of any cause.
Post-COVID conditions (PCC, or Long COVID) are a wide range of new, returning, or ongoing health problems people can experience four or more weeks after first being infected with the virus that causes COVID-19.
Post-acute COVID-19 is a syndrome characterized by the persistence of clinical symptoms beyond four weeks from the onset of acute symptoms. The Center for Disease Control (CDC) has formulated "post-Covid conditions" to describe health issues that persist more than four weeks after being infected with COVID-19
The Centers for Disease Control and Prevention said in a statement on May 24 that some people treated with Paxlovid experience “COVID-19 rebound” between two and 8 days after their initial recovery. These people experience a return of their symptoms and/or a new positive COVID test after having tested negative.
Some people who have been infected with the virus that causes COVID-19 can experience long-term effects from their infection, known as post-COVID conditions (PCC) or long COVID.
Symptoms. People with post-COVID conditions (or long COVID) may experience many symptoms. People with post-COVID conditions can have a wide range of symptoms that can last more than four weeks or even months after infection. Sometimes the symptoms can even go away or come back again.
Benefits of Vaccination Outweigh the Risks Serious side effects that could cause a long-term health problem are extremely unusual following any vaccination, including COVID-19 vaccination.
According to the Centers for Disease Control and Prevention, some people who contract COVID-19 can have detectable virus for up to three months, but that doesn't mean they are contagious. When it comes to testing, however, the PCR tests are more likely to continue picking up the virus following infection.
If you or a loved one had COVID‑19, you're likely wondering how long you might be protected from getting it again. In general, research suggests that natural immunity against infection is strong for about 3-5 months. After that, your risk of COVID‑19 reinfection may start to go up.
Some patients seem to be getting better and even testing negative for SARS-CoV-2 before then experiencing a recurrence of symptoms and retesting positive two to eight days later. The phenomenon has been termed “covid rebound.”
Currently, this type of rebounding appears to be rare. In Pfizers clinical trial, 1 to 2 percent of people treated with the antiviral had a positive COVID-19 test — or an increase in the amount of virus detected — after finishing the treatment.
The general concept of herd immunity implies that transmission of an infectious agent can be blunted, except for sporadic outbreaks, because a certain proportion of the population is already protected through vaccination or prior infection.