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A recent study by the U.S. Centers for Disease Control and Prevention found that 6% of more than 3,000 health care workers who were tested had antibodies to coronavirus. Still, after being retested 60 days later, 28% of them had antibody levels so low they were no longer detected."These results suggest that serology testing at a single time point is likely to underestimate the number of persons with previous SARS-CoV-2 infection, and a negative serologic test result might not reliably exclude prior infection," the authors of the study said.According to the CDC, blood samples were taken from 3,248 frontline health care personnel at 13 hospitals between April 3- June 19, 2020.194 of those healthcare workers had detectable antibodies to COVID, the agency said.Participants with higher initial antibody responses were more likely to have antibodies detected at the follow-up test than were those who had a lower initial antibody response, the study concluded.The authors added that the study shows that the window is limited for collecting potentially useful "convalescent plasma" from the blood of patients who have fought off COVID-19. 1151

A subject coughing in a cyclic incident. Top view of airborne droplet transmission with and without wearing a surgical mask. The top and bottom figures show the results at 4 s and 5 s, respectively. We consider a surgical mask that exhibits an initial efficiency of ～91%. The cover does not prevent the transport of the saliva droplets entirely away from the subject. Many droplets penetrate the mask shield and some saliva droplet disease-carrier particles can travel more than 1.2 m. For visualization, the droplets were scaled by a factor of 600 compared to their actual size. The environmental conditions are zero wind speed, ambient temperature 20 °C, pressure 1 atm, and relative humidity 50%. The mouth temperature is 34 °C, and the face skin temperature is 32 °C. 779

A nonprofit group dedicated to finding missing persons says they've found items that "brought a lot of interest" during their search for missing Fort Hood soldier Vanessa Guillen.Guillen, a private first class soldier assigned to the 3rd Cavalry Regiment, was reported missing on April 22. She was last seen in the parking lot of her Regimental Engineer Squadron Headquarters on Fort Hood at 11:30 a.m.The Army is currently investigating whether Guillen was sexually harassed prior to her disappearance. On Tuesday, Guillen's family met with officials from Fort Hood and the Texas Criminal Investigation Command (CID) who said that they suspect foul play in her disappearance.A number of organizations have joined efforts to find Guillen, including Texas EquuSearch — a local nonprofit dedicated to finding missing persons.Tim Miller says this is the fifth time he and Texas Equusearch have traveled to search the area for Guillen."Areas that we've searched, we've cleared," said Miller. "If she would have been there, we would have found her."The search-and-rescue team has searched several areas in and around a 25 mile stretch between Fort Hood and the Leon River, looking for anything that could lead to Guillen."I'm not going to say we found evidence in the Leon River. I'm not going to say that. I am going to say we found some things that are being tested," Miller said. "So whether they have anything to do with the case, I don't know. There's certainly some things that brought a lot of interest."Wednesday's search brought them to an undisclosed location in Bell County."I can't say why we're here," Miller said. "We have a reason to be here. So we want to get these fliers out and maybe jog somebody's memory. Maybe that right call will come in. This is an area that's got to be saturated. Again, I'm hoping the right person sees the flier and says, 'I need to make a phone call.'"Miller confirmed that while investigators have an idea of where Vanessa's phone went dead, the phone has not been located.There is a ,000 reward combined between CID and League of United Latin American Citizens for information leading to Guillen's whereabouts. Anyone who may have information in her disappearance should call CID agents at 254-495-7767.This story was originally published by Olivia Levada on KXXV in Waco, Texas. 2332

A Tokyo skyscraper is set to become the world's tallest wooden building.Japanese company Sumitomo Forestry says its 1,148-feet-tall timber tower will be completed in 2041, to mark the 350th anniversary of the business that year. The W350 tower will cost an estimated 600 billion yen (.6 billion) to build.The 70-story tower will be a hybrid structure made from 90% wooden materials. A steel vibration-control framework will underpin the design -- an important feature in a city where earthquakes are frequent.Green balconies will populate the skyscraper's exterior, connecting the building to its environment."The aim is to create environmentally-friendly and timber-utilizing cities where (cities) become forests through increased use of wooden architecture for high-rise buildings," the company said in a press release.The Japanese government is trying to encourage more developers to use wood. In 2010, it passed the Promotion of Use of Wood in Public Buildings Act, which required all government buildings up to three stories high to be constructed with wood, or to utilize wood. 1093

A surprise birthday party that resulted in 18 people testing positive for the coronavirus has left a North Texas man horrified as his father continues to fight for his life in a hospital intensive care unit.Ron Barbosa, who is married to a doctor and refused to attend the May 30 party for his daughter-in-law because of safety concerns amid the COVID-19 pandemic, said those hospitalized included his parents, both in their 80′s, and his sister, who is also battling breast cancer.Barbosa said his nephew, unknowingly infected with the virus, hosted last month’s gathering of 25 people that only lasted a few hours and followed the state’s latest health standards. During the party, he said the nephew interacted with seven relatives, who subsequently contracted the virus and spread it to 10 other family members, including two young children.“When people started getting sick, we really let everyone have it,” Barbosa told WFAA-TV. “We knew this was going to happen, I mean, this whole time this has been going on we’ve been terrified.”Gov. Greg Abbott on Thursday said Texas would halt its aggressive reopening as it deals with a surge in coronavirus cases and hospitalizations that has made the state a virus hot spot. Statewide, the number of COVID-19 patients has more than doubled in two weeks. Texas has reported more than 11,000 new cases in the previous two days alone.Barbosa’s mother, Carole, who stopped by the function to drop something off, tested positive for coronavrius June 6 and was admitted to the hospital a week later.Barbosa said his father, Frank, who didn’t attend the get-together but later contracted COVID-19, was hospitalized June 17. He said his dad is currently “hanging on by a thread” in the ICU while on life support.“It’s heartbreaking,” Barbosa said, holding back tears.Frank received a plasma donation Wednesday from a recovered coronavirus patient, according to Barbosa’s Facebook page. Barbosa said he hopes the procedure will save his dad’s life.“Prayers were answered today,” Barbosa wrote on Facebook. “Now he (Frank) needs to get well for mom and the Barbosa Family.”Barbosa said his family remains united despite feeling a pendulum of emotions over the past few weeks.“We were horrified. People couldn’t believe that they took it to a family member,” he said. “But now, we’re holding on together.”Carole has returned home to recover, according to a Facebook page the family created, which indicated that Barbosa’s sister, Kathy, is feeling better and back home to recuperate. 2529

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