CNBC: Delta variant is one of the most infectious respiratory diseases known, CDC director says

CNBC: Delta variant is one of the most infectious respiratory diseases known, CDC director says. “The delta Covid variant is one of the most infectious respiratory diseases ever seen by scientists, the director of the Centers for Disease Control and Prevention said Thursday. The variant is highly contagious, largely because people infected with the delta strain can carry up to 1,000 times more virus in their nasal passages than those infected with the original strain, according to new data.”

CNET: California theme park group wants you to stop screaming on roller coasters

CNET: California theme park group wants you to stop screaming on roller coasters. “This may be one of the biggest challenges of the coronavirus outbreak, much more difficult for most people than strapping on a face mask. A California theme-park trade group is joining those in Japan and recommending ways to limit screaming on roller coasters and other thrill rides, since screams produce saliva droplets that can spread COVID-19.”

CNN: Coronavirus spread on flight, in hotel corridor, New Zealand study finds

CNN: Coronavirus spread on flight, in hotel corridor, New Zealand study finds. “The coronavirus spread on an international flight, in a hotel corridor and then to household contacts despite efforts to isolate and quarantine patients, New Zealand researchers reported Thursday. Careful genomic tracing confirmed the spread of the virus among nine patients and shows how people can infect one another despite careful efforts, the researchers reported in the journal Emerging Infectious Diseases.”

Brief19: Coronavirus MRNA Vaccines Reduce The Risk Of Asymptomatic Infection

Brief19: Coronavirus MRNA Vaccines Reduce The Risk Of Asymptomatic Infection. “This research, conducted by the Mayo Clinic health system across its hospitals in Minnesota, Arizona, and Wisconsin, recruited patients requiring covid-19 testing 48 to 72 hours ahead of planned procedures and surgeries. The patients were divided into two cohorts: those who had received at least one dose of either vaccine and those who hadn’t had a shot yet at the time of the testing. Of the nearly 40,000 patients who were tested, 3.2 percent of the unvaccinated group tested positive, while only 1.4 percent of the protected group was found to have contracted SARS-CoV-2. This was a statistically notable difference and suggests a relative risk reduction of 44 percent after getting vaccinated for asymptomatic disease.”

Back to school: University of Cambridge online tool shows how ventilation reduces risk of Covid-19 transmission in classroom (Cambridge Independent)

Cambridge Independent: Back to school: University of Cambridge online tool shows how ventilation reduces risk of Covid-19 transmission in classrooms. “With pupils heading back in classrooms from March 8, a new tool created by Cambridge University researchers could help show schools how to reduce the risk of infections in classrooms. The scientists have built the tool Airborne.cam to show the impact of wearing masks, opening windows and taking more break times on reducing the amount of Covid-19 virus in the air.”

CBS: Democratic leaders criticize Biden administration’s “outmoded” guidance on aerosol COVID-19 spread

CBS News: Democratic leaders criticize Biden administration’s “outmoded” guidance on aerosol COVID-19 spread. “In a four-page letter addressed to White House COVID response chief Jeff Zients, Centers for Disease Control and Prevention Director Rochelle Walensky and acting Labor secretary Al Stewart, four House committee chairs say they have ‘serious questions’ about the adequacy of the CDC’s guidance on workplace protection from aerosol transmission.”

Phys .org: Tourists could be spreading the virus causing COVID-19 to wild mountain gorillas by taking selfies with the animals

Phys .org: Tourists could be spreading the virus causing COVID-19 to wild mountain gorillas by taking selfies with the animals. “Tourists could be spreading the virus causing COVID-19 to wild mountain gorillas by taking selfies with the animals without following precautions. Researchers from Oxford Brookes University examined nearly 1,000 Instagram posts and found most gorilla trekking tourists were close enough to the animals, without face masks on, to make transmission of viruses and diseases possible.”

Chicago Tribune: Is the COVID-19 pandemic growing or shrinking in Illinois? New website tracks a key metric.

Chicago Tribune: Is the COVID-19 pandemic growing or shrinking in Illinois? New website tracks a key metric.. “A group of Illinois COVID-19 researchers has launched a webpage to try to help residents see and make sense of the latest pandemic trends, including one of the easiest metrics to understand: the reproduction rate. Though it’s based on complicated math, the reproduction rate offers a simple gauge of the pandemic’s trajectory. A number above 1 means the epidemic is growing. Below 1 means it’s shrinking.”

EurekAlert: Proper fit of face masks is more important than material, study suggests

EurekAlert: Proper fit of face masks is more important than material, study suggests. “The researchers, from the University of Cambridge, carried out a series of different fit tests, and found that when a high-performance mask – such as an N95, KN95 or FFP2 mask – is not properly fitted, it performs no better than a cloth mask. Minor differences in facial features, such as the amount of fat under the skin, make significant differences in how well a mask fits.”

Brief19: New Data Gives Insight On How Long Patients Can Spread Coronavirus

Brief19: New Data Gives Insight On How Long Patients Can Spread Coronavirus. “Precisely how long patients infected with SARS-CoV-2 are contagious has been the focus of intense debate and scrutiny, with implications on how long isolation periods should last. One problem has been that people who contract the virus may generate positive tests via PCR nasal swab for weeks on end. At some points, patients test positive via PCR, but are no longer contagious.”