coronavirus how long do symptoms last

  • 6 min read
  • Apr 03, 2019

Symptoms | CDC
Symptoms | CDC

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A new study could have implications for how the public and health care workers generally try to avoid transmission of the virus.

by Apoorva Mandavilli

coronavirus can live for three days on some surfaces, such as plastic and steel, new research shows. Experts say the risk of infection from touching the ingredients consumers are still low, even though they offer additional warnings about how long the virus survives in the air, which may have important implications for medical personnel.

The new study, also showed that the virus destroyed during a day in cardboard boxes, reducing fears among consumers that shipments will spread the virus during this period living and working from home.

When the virus becomes suspended in small droplets of 5 micrometers – known as aerosols – can remain suspended for about half an hour, the researchers say, before it floated down and settled on the surface where it can linger for hours. Findings on aerosols in particular are not consistent with the position of the World Health Organization that the virus is not transported by air.

This virus was the longest living on plastic and steel, surviving up to 72 hours. But the number of viable virus dropped significantly over this time. It also performed poorly on copper, which are still alive four hours. On the cardboard, it lasts up to 24 hours, which shows that the package arrived in the mail should have only low levels of virus -. Unless the delivery person has cough or sneeze on it or have been treated with contaminated hands

That’s true in general. Except for those who handle these materials ill, the actual risk of infection from any of these materials is low, experts said.

“Everything in the shop and restaurant takeout containers and bags could in theory have infectious virus in them,” said Dr Linsey Marr, who is not a member of the research team, but is an expert in the transmission of the virus by aerosol in Virginia Tech in Blacksburg. “We can discuss this crazy ‘what if’ because everyone is a potential source, so we have to focus on the greatest risk.”

If people are worried about the risks, they can wipe down the package with disinfectant wipes and wash their hands, he said.

It is not clear why the cardboard should be less hospitable environment for the viruses of plastic or steel, but can be explained by the absorption or fibrous quality of packaging compared to other surfaces.

The virus can survive and remain infectious in aerosols is also important for health care workers.

for the week experts have stated that this virus is not air-conditioned. But in fact, it can travel through the air and stay suspended for a period of about half an hour.

The virus does not linger in the air at levels high enough to be a risk for most people who are not physically near the infected person. But officer medical procedure used to treat patients who are infected tend to produce aerosol.

“Once you get a patient with severe pneumonia, the patient needs to be intubated,” said Dr. Vincent Munster, a virologist at the National Institute of Allergy and Infectious Diseases, who led the study. “All of this treatment may produce aerosols and droplets.”

The health care provider may also collect their small droplets and the greater their protective gear when working with infected patients. They may resuspend these large and small droplets into the air when they remove this protection and become exposed to the virus later, Dr. Marr warned.

A study is being reviewed by experts. And another study published March 4 in JAMA, also indicates that the virus is transported by air. The study, which is based in Singapore, was found in the hospital room of the infected patient, where it can only be reached by air.

Dr. Marr said the World Health Organization called the virus so far does not air, but that health care workers should wear gear, including a respirator mask, with the assumption that it is.

“Based on aerosol science and recent findings on the flu virus,” he said, “a surgical mask may not be enough. ‘

Dr. Marr said that based on physics, aerosol released at a height of about six feet will fall to the ground after 34 minutes. The findings should not cause public panic, however, because the virus spreads quickly in the air.

“It’s sounds scary, “she says, ‘but unless you’re close to someone, the amount that you have been exposed to very low.’

Dr. Marr compared to cigarette smoke or foggy breath on a cold day. The closer a fast and others are to smoke or breathe, the more the smell they might catch; for anyone away from a few feet away, there is too little virus in the air into danger.

To assess the ability of the virus to survive in the air, the researchers created what Dr. Munster described as “strange experiments conducted under controlled experimental conditions are very suitable.” They use a rotating drum to suspend aerosols, and provide temperature and humidity levels that closely mimics the conditions in the hospitals.

In this configuration, the virus survive and stay infectious for up to three hours, but its ability to infect the drops sharply from time to time, he said.

He said, aerosols may only stay aloft for about 10 minutes, but Dr. Marr did not agree with that assessment, and said they could stay in the air for three times longer. He also said that the experimental setup may be less convenient to the virus from a real-life setting.

For example, she said, researchers use a relative humidity of 65 percent. “Many, but not all viruses, have shown that they survive the worst on the moisture level,” he said. They do best at lower humidity or higher. Humidity in the house is heated less than 40 percent, “in which the virus can survive for much longer,” he said.

The mucus and respiratory fluids may also allow the virus to survive longer than drilling fluids laboratory that researchers used for their experiments.

Other experts say the findings of a paper describing the urgent need for more information about the ability of the virus to survive in aerosols, and under different conditions.

“We need more experiments like this, in particular, extending the time experimental sampling for virus aerosols over three hours and test the viability under temperature and humidity conditions are different,” said Dr. Jeffrey Shaman, an expert environmental health sciences at Columbia University.

Dr. Munster noted that, overall, the new coronavirus does not seem to be able to survive for long periods of its close cousin of SARS and mer, which caused an epidemic previously. That shows there was another reason, such as transmission by people who do not have symptoms, because of its ability to cause a pandemic.

Updated March 17, 2020

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