Global Statistics

All countries
554,450,929
Confirmed
Updated on July 4, 2022 7:56 am
All countries
526,775,539
Recovered
Updated on July 4, 2022 7:56 am
All countries
6,361,548
Deaths
Updated on July 4, 2022 7:56 am

Global Statistics

All countries
554,450,929
Confirmed
Updated on July 4, 2022 7:56 am
All countries
526,775,539
Recovered
Updated on July 4, 2022 7:56 am
All countries
6,361,548
Deaths
Updated on July 4, 2022 7:56 am
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When Are People Most Contagious With Covid

How Covid Damages The Brain

How COVID-19 spreads quickly from person to person

COVID can cause damage to the brain directly by encephalitis, which may have devastating or subtle consequences. In one British study of 12 patients with encephalitis, one made a full recovery, 10 made a partial recovery, and one died. This study also found that a number of patients with COVID suffered strokes. In fact, COVID infection is a risk factor for strokes. A group of Canadian doctors found that individuals over 70 years of age were at particularly high risk for stroke related to COVID infection, but even young individuals are seven times more likely to have a stroke from this coronavirus versus a typical flu virus.

Autopsy data from COVID patients in Finland suggests that another major cause of brain damage is lack of oxygen. Particularly worrisome is that several of the patients who were autopsied did not show any signs of brain injury during the course of their COVID infection yet all had brain damage. In one patient there was loss of taste, and in two there was minimal respiratory distress, but none of these patients were thought to have any brain damage while alive.

What Is A Variant Of Concern

Coronavirus variants are classified in different categories by organizations such as the World Health Organization and the Centers for Disease Control and Prevention .

A variant of interest is a coronavirus variant that, compared to earlier forms of the virus, has genetic characteristics that predict greater transmissibility, evasion of immunity or diagnostic testing or more severe disease.

A variant of concern has been observed to be more infectious, more likely to cause breakthrough or re-infections in those who are vaccinated or previously infected. These variants are more likely to cause severe disease, evade diagnostic tests, or resist antiviral treatment. Alpha, beta, gamma, and delta variants of the SARS-CoV-2 coronavirus are classified as variants of concern.

A variant of high consequence is a variant for which current vaccines do not offer protection. As of now, there are no SARS-CoV-2 variants of high consequence.

Can People Infect Pets With The Covid

The virus that causes COVID-19 does appear to spread from people to pets, according to the FDA, though this is uncommon. Research has found that cats and ferrets are more likely to become infected than dogs.

If you have a pet, do the following to reduce their risk of infection:

  • Avoid letting pets interact with people or animals that do not live in your household.
  • Keep cats indoors when possible to prevent them from interacting with other animals or people.
  • Walk dogs on a leash maintaining at least six feet from other people and animals.
  • Avoid dog parks or public places where a large number of people and dogs gather.

If you become sick with COVID-19, restrict contact with your pets, just like you would around other people. This means you should forgo petting, snuggling, being kissed or licked, and sharing food or bedding with your pet until you are feeling better. When possible, have another member of your household care for your pets while you are sick. If you must care for your pet while you are sick, wash your hands before and after you interact with your pets and wear a face mask.

At present, it is considered unlikely that pets can spread the COVID-19 virus to humans. However, pets can spread other infections that cause illness, including E. coli and Salmonella, so wash your hands thoroughly with soap and water after interacting with your animal companions.

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Will There Be More New Coronavirus Variants

Yes. As long as the coronavirus spreads through the population, mutations will continue to happen, and the delta variant family continues to evolve.

New variants of the SARS-CoV-2 virus are detected every week, Ray says. Most come and go some persist but dont become more common some increase in the population for a while, and then fizzle out. When a change in the infection pattern first pops up, it can be very hard to tell whats driving the trend changes to the virus, or changes in human behavior. It is worrisome that similar changes to the spike protein are arising independently on multiple continents.

If I Get Sick With Covid

Delta variant of COVID

It varies. Most people with mild cases appear to recover within one to two weeks. However, recent surveys conducted by the CDC found that recovery may take longer than previously thought, even for adults with milder cases who do not require hospitalization. The CDC survey found that one-third of these adults had not returned to normal health within two to three weeks of testing positive for COVID-19. Among younger adults who did not require hospitalization and who did not have any underlying health conditions, nearly one in five had not returned to normal health within two to three weeks after testing positive for COVID-19. With severe cases, recovery can take six weeks or more.

Some people may experience longer-term physical, cognitive, and psychological problems. Their symptoms may alternately improve and worsen over time, and can include a variety of difficulties, from fatigue and trouble concentrating to anxiety, muscle weakness, and continuing shortness of breath.

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The Most Dangerous Times For Covid

According to a recent study, people infected with the COVID-19 virus are most at risk of transmitting it to others between two days before and three days after they develop symptoms, with risk reaching its peak on the day symptoms first present themselves.

In previous studies, viral load has been used as an indirect measure of transmission, says Leonardo Martinez, assistant professor of epidemiology at Boston Universitys School of Public Health and study co-lead. We wanted to see if results from these past studies, which show that COVID cases are most transmissible a few days before and after symptom onset, could be confirmed by looking at secondary cases among close contacts.

The researchers did contact tracing and studied COVID-19 transmission among 8,852 close contacts of 730 primary cases in China from January 2020 to August 2020. A primary case is the first infected person in an outbreak. Close contacts included individuals who lived in the same household or ate together, co-workers, people in hospital settings and riders in shared vehicles.

Those who were infected were monitored for at least 90 days after their initial positive COVID-19 test results to separate asymptomatic and pre-symptomatic cases.

These risk factors had no impact on the finding that close contacts were more likely to catch COVID-19 from the primary infected person if they were exposed shortly before or after that person developed detectable symptoms.

I Recently Spent Time With Someone Who Tested Positive For Covid

Yes, you do. In July 2021, the CDC recommended that anyone who is fully vaccinated and comes into contact with someone who has, or is suspected of having, COVID-19 should get tested three to five days after exposure. In addition, you should wear a mask in public indoor settings for 14 days or until you receive a negative test result. If you are vaccinated, you do not need to quarantine, but you should isolate if you develop symptoms or receive a positive test result.

Previously, the CDC had said that someone who was fully vaccinated only needed to get tested after exposure if they were experiencing symptoms. The change follows new evidence regarding the Delta variant, which shows that people who are vaccinated and then get infected can spread the virus to others, perhaps to the same extent as those who are unvaccinated.

If you are not fully vaccinated, a 14-day quarantine remains the best way to avoid spreading the virus to others after you’ve been exposed to someone with COVID-19. According to CDC guidelines, you may discontinue quarantine after a minimum of 10 days if you do not have any symptoms, or after a minimum of seven days if you have a negative COVID test within 48 hours of when you plan to end quarantine.

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Assessment For Duration Of Isolation

Available data suggest that patients with mild-to-moderate COVID-19 remain infectious no longer than 10 days after symptom onset.

Most patients with more severe-to-critical illness or those who are severely immunocompromised likely remain infectious no longer than 20 days after symptom onset however, there have been several reports of severely immunocompromised people shedding replication-competent virus beyond 20 days.

Patients who have recovered from COVID-19 can continue to have detectable SARS-CoV-2 RNA in upper respiratory specimens for up to 3 months after illness onset in concentrations considerably lower than during illness however, replication-competent virus has not been reliably recovered and infectiousness is unlikely. The circumstances that result in persistently detectable SARS-CoV-2 RNA have yet to be determined. Studies have not found evidence that clinically recovered adults with persistence of viral RNA have transmitted SARS-CoV-2 to others. These findings strengthen the justification for relying on a symptom-based rather than test-based strategy for ending isolation of most patients.

When Are You Most Contagious With Covid How Long Symptoms Last And Omicron Incubation Period Explained

UK coronavirus variant most common strain in U.S., CDC says

The Omicron variant is continuing to cause record Covid-19 case numbers in the UK.

More than 200,000 positive cases were recorded on 30 December for the first time since the start of the pandemic, and numbers have remained consistently high.

Rocketing case numbers are still forcing more and more people to self-isolate and driving up hospitalisations, putting strain on health services.

Scientists believe part of the reason Omicron cases have risen so quickly is because it may be quicker to infect people than older strains like Delta and Alpha.

Heres everything you need to know about how long it can take, and when people are most infectious.

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How Long Should You Quarantine Or Isolate

First things first, those who believe they have been in contact with someone who has COVID and are unvaccinated should quarantine. Those who test positive, regardless of vaccination status, must isolate, according to the Centers for Disease Control and Prevention.

Here’s the difference between the two:

Quarantine

Those who have been within six feet of someone with COVID for a cumulative total of at least 15 minutes over a 24-hour period should quarantine for five days if unvaccinated, or if they are more than six months out from their second vaccine dose, according to updated CDC guidance issued Monday.

Once that period ends, they should partake in strict mask use for an additional five days.

Previously, the CDC said people who were not fully vaccinated and who came in close contact with an infected person should stay home for at least 10 days.

Prior to Monday, people who were fully vaccinated which the CDC has defined as having two doses of the Pfizer or Moderna vaccines, or one dose of the Johnson & Johnson vaccine could be exempt from quarantine.

Those who are both fully vaccinated and boosted do not need to quarantine if they are a close contact of someone with COVID, but should wear a mask for at least 10 days after exposure. The same goes for those who are fully vaccinated and not yet eligible for their booster shot.

Local health authorities can also make the final determination about how long a quarantine should last, however, and testing can play a role.

For How Long After I Am Infected Will I Continue To Be Contagious At What Point In My Illness Will I Be Most Contagious

People are thought to be most contagious early in the course of their illness, when they are beginning to experience symptoms, especially if they are coughing and sneezing. But people with no symptoms can also spread the coronavirus to other people. In fact, people who are infected may be more likely to spread the illness if they are asymptomatic, or in the days before they develop symptoms, because they are less likely to be isolating or adopting behaviors designed to prevent spread.

A full, 14-day quarantine remains the best way to avoid spreading the virus to others after you’ve been exposed to someone with COVID-19. However, according to CDC guidelines, you may discontinue quarantine after a minimum of 10 days if you do not have any symptoms, or after a minimum of seven days if you have a negative COVID test within 48 hours of when you plan to end quarantine.

If you are fully vaccinated and have been around someone with or suspected of having COVID-19 you do not need to quarantine. However, as of July 2021, the CDC recommends that you be tested thre to five days after exposure, and wear a mask in public indoor settings for 14 days or until you receive a negative test result.

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What Should I Do If I Think I Or My Child May Have A Covid

First, call your doctor or pediatrician for advice.

If you do not have a doctor and you are concerned that you or your child may have COVID-19, contact your local board of health. They can direct you to the best place for testing and treatment in your area.

If you have a high or very low body temperature, shortness of breath, confusion, or feeling you might pass out, you need to seek immediate medical evaluation. Call the urgent care center or emergency department ahead of time to let the staff know that you are coming, so they can be prepared for your arrival.

Are Coronavirus Variants More Dangerous

Fight against highly contagious COVID

Bollinger says that some of these mutations may enable the coronavirus to spread faster from person to person, and more infections can result in more people getting very sick or dying. In addition, studies are underway to determine whether some variants could be associated with more severe disease.

Therefore, it is very important for us to expand the number of genetic sequencing studies to keep track of these variants, he says.

Bollinger explains that it may be more advantageous for a respiratory virus to evolve so that it spreads more easily. On the other hand, mutations that make a virus more deadly may not give the virus an opportunity to spread efficiently. If we get too sick or die quickly from a particular virus, the virus has less opportunity to infect others. However, as we have seen with delta, more infections from a faster-spreading variant will lead to more hospitalizations and deaths, he notes.

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Vaccinated People Appear To Be Less Contagious

So, while the true answer to how long people with breakthrough infections are contagious is we dont really know yet, scientists have learned a few things.

A study from Singapore found that although the viral loads for vaccinated and unvaccinated people had similar peaks at the start of the infection, the viral loads in vaccinated people dropped much more rapidly compared to unvaccinated people. The viral load in vaccinated people dropped to levels that are generally believed to be not infectious around six days after the the onset of illness. Meanwhile, the viral load in unvaccinated people dropped to that same level at the 10-day mark.

A Harvard study similarly found that vaccinated people appear to clear the virus in 5½ days versus unvaccinated people who cleared it out in 7½ days. Another report from the University of Illinois found more of the same. Vaccinated people clear it from the upper airway faster, so they are less contagious, said Adam Ratner, the director of pediatric infectious diseases and a member of the Vaccine Center at New York University Langone Health.

Researchers from the Netherlands took it a step further and looked at respiratory samples taken from vaccinated people with breakthrough infections and found that the virus in their noses was less likely to be infectious compared to unvaccinated people who got COVID. Still, infectious virus was detected in 68% of the vaccinated participants .

Vaccinated People Clear The Virus Quicker

The results of the Lancet study suggest similarities in terms of viral load between vaccinated and unvaccinated people. But the study doesnt provide strong evidence that vaccines dont work to prevent transmission through the population.

While the peak load may be similar, vaccinated people are likely to have lower viral load overall, and therefore be less contagious.

Given vaccines speed the clearance of COVID from the body, vaccinated people have less opportunity to spread the virus overall.

This appears to be the case even with the more infectious Delta variant.

While the Lancet study specifically collected an even number of vaccinated and unvaccinated infections in order to compare them, this isnt a true representation of the community in Australia. We know being fully vaccinated reduces the likelihood of catching COVID even if the vaccines arent perfect and there are breakthrough infections.

While its difficult to estimate the rate of breakthrough infections accurately, studies have estimated they occur in 0.2% to 4% of people. In reality, this means that for every 100 vaccinated people, somewhere between 0.2 and 4 of them would get COVID.

So, while in the rare instance where a breakthrough infection occurs, there may be a similar viral load, and possibly a similar infectiousness, there remain much fewer vaccinated people getting COVID.

Read more:Your unvaccinated friend is roughly 20 times more likely to give you COVID

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What Is The Difference Between A Pcr Test And An Antigen Test For Covid

PCR tests and antigen tests are both diagnostic tests, which means that they can be used to determine whether you currently have an active coronavirus infection. However, there are important differences between these two types of tests.

PCR tests detect the presence of the virus’s genetic material using a technique called reverse transcriptase polymerase chain reaction, or RT-PCR. For this test, a sample may be collected through a nasal or throat swab, or a saliva sample may be used. The sample is typically sent to a laboratory where coronavirus RNA is extracted from the sample and converted into DNA. The DNA is then amplified, meaning that many of copies of the viral DNA are made, in order to produce a measurable result. The accuracy of any diagnostic test depends on many factors, including whether the sample was collected properly, when during the course of illness the testing was done, and whether the sample was maintained in appropriate conditions while it was shipped to the laboratory. Generally speaking, PCR tests are highly accurate. However, it can take days to over a week to get the results of a PCR test.

It may be helpful to think of a COVID antigen test as you would think of a rapid strep test or a rapid flu test. A positive result for any of these tests is likely to be accurate, and allows diagnosis and treatment to begin quickly, while a negative result often results in further testing to confirm or overturn the initial result.

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