Coronavirus spread

U.S. CDC says coronavirus could spread through air – Reuters

Sept 21 (Reuters) – The U.S. Centers for Disease Control and Prevention has warned that COVID-19 could spread through airborne particles that can remain suspended in the air and travel beyond six feet.

The agency previously said the virus mainly spreads from person to person through respiratory droplets when a sick person coughs, sneezes or talks.

The updated guidance, posted on the agency’s website on Friday, also recommended that people use air purifiers to reduce airborne germs indoors to avoid the disease from spreading. (

Airborne viruses are among the most contagious, and the CDC warned that poorly-ventilated places increase the risk of spreading.

Studies have shown that the new coronavirus could spread through aerosols in the air, and the World Health Organization has said it is monitoring “emerging evidence” of possible airborne transmission.

Reporting by Manas Mishra in Bengaluru; Editing by Ramakrishnan M.


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asymptomatic spread

Wait… so, asymptomatic spread of the coronavirus is actually ‘very rare’? – MarketWatch

Key Words


No fever, no problem?

‘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.’

That’s Dr. Maria Van Kerkhove, head of WHO’s emerging diseases and zoonosis unit, seemingly contradicting what many have been led to believe about the transmission of the coronavirus.

In other words, while it still happens in some cases, patients without symptoms aren’t generally the ones driving the spread. This flies in the face of previous research warning the disease could be difficult to contain because of asymptomatic infections.

“We have a number of reports from countries who are doing very detailed contact tracing,” Van Kerkhove said at a briefing Monday from the U.N.’s headquarters. “They’re following asymptomatic cases. They’re following contacts. And they’re not finding secondary transmission onward.”

Watch the clip, courtesy of CNBC:

Back in April, the Centers for Disease Control and Prevention reported on the “potential for presymptomatic transmission” as a reason for maintaining social-distancing restrictions.

“To control the pandemic, it might not be enough for only persons with symptoms to limit their contact with others because persons without symptoms might transmit infection,” the CDC found.

Ashish Jha, incoming dean at the Brown School of Public Health, addressed some of the questions that bubbled up after the WHO’s latest findings were announced, and questioned whether WHO was referring to truly asymptomatic cases (those who have the disease but never develop symptoms) or pre-symptomatic (those who have the virus before they start showing symptoms).

Jha added: “@WHO communication here not stellar. If folks without symptoms truly ’very rarely’ spread virus, would be huge. But such a statement by @WHO should be accompanied by data. Asymptomatic spread is Achille’s heal of this outbreak. Would love to be wrong. Need to see data.”

Peter Hotez, an infectious disease expert at Baylor University, also entered the conversation:

The takeaway: Clearly, there are still a lot of unknowns about the cororonavirus.

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Coronavirus spread

See how coronavirus has spread in Oregon counties; Marion County now has second-most infections – OregonLive

Washington County earned the notorious distinction as Oregon’s epicenter of coronavirus infections for more than a month.

But that changed April 11. Oregon’s most populous county, Multnomah, finally caught up and surpassed its western neighbor’s total number of known cases.

Washington County has been leapfrogged again. This time, by Marion County.

Marion County passed Washington County in total infections on May 1. Marion County infections have been climbing steadily upward even as Washington County’s have appeared to bend slightly toward flattening.

Clackamas County stands alone with the fourth-most infections.

The Oregonian/OregonLive charted identified coronavirus infections, by county, to show how the virus has spread since first being identified in Oregon on Feb. 28. The chart includes all counties that have reported at least 30 infections.

It’s no surprise that Multnomah, Washington and Clackamas counties — the three most populous in Oregon and home to the Portland metro area — rank highly in total infections.

But Marion County, which has the state’s fifth-most residents, stands out. Based on population, Marion County has by far the highest rate of infection in Oregon and now it has the second-most total infections.

The Woodburn area of Marion County has been especially hard hit by coronavirus infections, according to the Salem Reporter.

— Brad Schmidt;; 503-294-7628; @_brad_schmidt

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