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WHO clarifies stance on the asymptomatic spread of coronavirus

It's not as rare as a misunderstanding on Monday led people to believe.

WHO clarifies stance on the asymptomatic spread of coronavirus
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Plenty of parents and teachers are worried about how COVID-19 could spread in school settings, so a suggestion that asymptomatic spread of the virus is 'very rare' piqued the interest of many this week. Unfortunately, the reasons why public health experts have emphasized social distancing during the pandemic still stand, because people can spread the virus without even knowing they are sick or showing symptoms.

On Monday, a World Health Organization official stated that the spread of the virus from asymptomatic people is very rare...but by Tuesday the WHO was walking back the claim.

The clarification comes after experts disagreed with the Van Kerkhove's suggestion on Monday.

Liam Smeeth, a professor of clinical epidemiology at the London School of Hygiene and Tropical Medicine, says Van Kerkhove's statements shocked him. "I was quite surprised by the WHO statement," he explained. "It goes against my impressions from the science so far that suggest asymptomatic people—who never get symptoms—and pre-symptomatic people are an important source of infection to others."


Dr. Maria Van Kerkhove, head of WHO's emerging diseases and zoonosis unit, originally told reporters on Monday, "From the data we have, it still seems to be rare that an asymptomatic person actually transmits onward to a secondary individual. It's very rare."

But by Tuesday Van Kerkhove said there had been "misunderstandings" regarding her Monday statement and clarified that what she was referring to as "very rare" was a subset of studies, not asymptomatic transmission globally. She also added, "Some estimates of around 40% of transmission may be due to asymptomatic, but those are from models, and so I didn't include that in my answer yesterday but wanted to make sure that I covered that here."

The science is evolving to catch up with the virus, and experts suggest that distinguishing between asymptomatic, pre-symptomatic and paucisymptomatic (presenting few symptoms) is important here.

"Detailed contact tracing from Taiwan as well as the first European transmission chain in Germany suggested that true asymptomatics rarely transmit. However, those (and many other) studies have found that paucisymptomatic transmission can occur, and in particular, in the German study, they found that transmission often appeared to occur before or on the day symptoms first appeared," Dr. Babak Javid, a principal investigator at Tsinghua University School of Medicine in Beijing and consultant in infectious disease at Cambridge University Hospitals, said this week.

Bottom line: The science suggests that we need to focus on testing, tracing and quarantining those with symptoms rather than living in fear of asymptomatic spread, but we do need to recognize that asymptomatic spread is a possibility.

As first reported by CNBC, the Centers for Disease Control has previously suggested that it's necessary for people to remain socially distant even from those who don't have symptoms because the symptomless people can spread the virus. The CDC notes: "The potential for presymptomatic transmission underscores the importance of social distancing, including the avoidance of congregate settings, to reduce COVID-19 spread."

We do need to continue keeping our distance, at least for now.

In This Article

    Tips parents need to know about poor air quality and caring for kids with asthma

    There are steps parents can take to keep their children as healthy as possible.

    When wildfires struck the West Coast in September 2020, there was a lot for parents to worry about. For parents of children with asthma, though, the danger could be even greater. "There are more than 400 toxins that are present in wildfire smoke. That can activate the immune system in ways that aren't helpful by both causing an inflammatory response and distracting the immune system from fighting infection," says Amy Oro, MD, a pediatrician at Stanford Children's Health. "When smoke enters into the lungs, it causes irritation and muscle spasms of the smooth muscle that is around the small breathing tubes in the lungs. This can lead to difficulty with breathing and wheezing. It's really difficult on the lungs."

    With the added concern of COVID-19 and the effect it can have on breathing, many parents feel unsure about how to keep their children protected. The good news is that there are steps parents can take to keep their children as healthy as possible.

    Here are tips parents need to know about how to deal with poor air quality when your child has asthma.

    Minimize smoke exposure.

    Especially when the air quality index reaches dangerous levels, it's best to stay indoors as much as possible. You can find out your area's AQI at AirNow.gov. An under 50 rating is the safest, but between 100-150 is considered unhealthy for sensitive groups, such as children with asthma. "If you're being told to stay indoors, listen. If you can, keep the windows and doors closed," Oro says.

    Do your best to filter the air.

    According to Oro, a HEPA filter is your best bet to effectively clean pollutants from the air. Many homes are equipped with a built-in HEPA filter in their air conditioning systems, but you can also get a canister filter. Oro says her family (her husband and children all suffer from asthma) also made use of a hack from the New York Times and built their own filter by duct taping a HEPA furnace filter to the front of a box fan. "It was pretty disgusting what we accumulated in the first 20 hours in our fan," she says.

    Avoid letting your child play outside or overly exert themselves in open air.

    "Unfortunately, cloth masks don't do very much [to protect you from the smoke pollution]," Oro says. "You really need an N95 mask, and most of those have been allocated toward essential workers." To keep at-risk children safer, Oro recommends avoiding brisk exercise outdoors. Instead, set up an indoor obstacle course or challenge your family to jumping jacks periodically to keep everyone moving safely.

    Know the difference between smoke exposure and COVID-19.

    "COVID-19 can have a lot of the same symptoms—dry cough, sore throat, shortness of breath and chest pain could overlap. But what COVID and other viruses generally cause are fever, chills, vomiting, diarrhea and body aches. Those would tell you it's not just smoke exposure," Oro says. When a child has been exposed to smoke, they often complain of a "scrape" in their throat, burning eyes, cough, shortness of breath, chest pain or wheezing. If the child has asthma, parents should watch for a flare of symptoms, such as coughing, wheezing or a tight sensation in their chest.

    Unfortunately, not much is known about long-term exposure to wildfire smoke on a healthy or compromised immune system, but elevated levels of air pollution have been associated with increased COVID-19 rates. That's because whenever there's an issue with your immune system, it distracts your immune system from fighting infections and you have a harder time fighting off viruses. Limiting your exposure to wildfire smoke is your best bet to keep immune systems strong.

    Have a plan in place if you think your child is suffering from smoke exposure.

    Whatever type of medication your child takes for asthma, make sure you have it on-hand and that your child is keeping up with regular doses. Contact your child's pediatrician, especially if your area has a hazardous air quality—they may want to adjust your child's medication schedule or dosage to prevent an attack. Oro also recommends that, if your child has asthma, it might be helpful to have a stethoscope or even a pulse oximeter at home to help diagnose issues with your pediatrician through telehealth.

    Most importantly, don't panic.

    In some cases, social distancing and distance learning due to COVID may be helping to keep sensitive groups like children with asthma safer. Oro says wildfires in past years have generally resulted in more ER visits for children, but the most recent fires haven't seen the same results. "A lot of what we've seen is that the smoke really adversely affects adults, especially older adults over 65," Oro says. "Children tend to be really resilient."

    This article was sponsored by Stanford Children's Health. Thank you for supporting the brands that support Motherly and mamas.

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