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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 rural Oklahoma school system closed for two days earlier this week after a group of adults made threatening Facebook comments about a 12-year-old transgender girl, Achille Public Schools Superintendent Rick Beene said.The incident began after the student used the middle school girl's bathroom this year at Achille school system in southern Oklahoma, Beene said. In previous years at the district elementary school, she had used the staff bathroom.Two district parents complained about her use of the girl's bathroom in a private Facebook group called "Achille ISD Parents Group," which is not officially affiliated with the school, according to Beene.The threats escalated in severity and number when someone made the Facebook group public, Beene said, and some of the Facebook threats have been traced to other parts of Oklahoma and Texas.According to CNN affiliate KXII, Facebook commenters called the seventh grader, "it" and "thing." One Facebook poster suggested it was open hunting season for transgender people, and others advocated for the 12-year-old to be stabbed or beaten up."That's scary," Brandy Rose, the girl's mother, told KXII. "These are adults making threats to a child. I don't understand it."The Facebook page appears to have since been deleted. Still, Rose said the comments had scared her daughter."She's just an awesome kid. To see any kind of fear in her like that, because other people, especially adults, I can't explain how bad that hurts me," she said. 1498

A Philadelphia police officer who was seen on video pulling down the masks of protesters and spraying chemical irritants in their faces was charged Wednesday with simple assault, reckless endangerment, official oppression, and possession of an instrument of crime, the Philadelphia Inquirer and CNN report.Officer Richard P. Nicoletti, 35, turned himself in on Wednesday.The charges against Nicoletti stem from a June 1 Black Lives Matter protest, when demonstrators blocked I-676 in Philadelphia. Bystander video showed Nicoletti — who was acting as part of the Philadelphia Police SWAT team — approaching three protesters who were kneeling and sitting on the ground.The video shows Nicoletti pull down the demonstrators' masks and spray pepper spray in their faces. He also shoved one of the protesters. The District Attorney's statement claimed Nicoletti sprayed the protesters "without provocation."None of the demonstrators were arrested.According to CNN, the Philadelphia Police Department reviewed the bystander video and opened an investigation on June 24.The officer's lawyer, Fortunato Perri Jr., said Nicoletti was simply following orders."His unit was ordered by commanders to clear the highway with the approved use of tear gas and pepper spray," Perri said, according ot the Inquirer. "The city's leadership was given the opportunity to apologize for approving the use of force, but Nicoletti finds himself fired and charged with crimes." 1460

A third leading candidate COVID-19 vaccine has entered a final stage of human testing in the United States. AstraZeneca announced Monday its potential COVID-19 vaccine has entered final trials in the U.S. to test the effectiveness and safety of the product. The Cambridge, England-based company said the trial will involve up to 30,000 adults from various racial, ethnic and geographic groups. The potential vaccine was invented by the University of Oxford and an associated company, Vaccitech.AstraZeneca said development of the vaccine known as AZD1222 is moving ahead globally with late-stage trials in the U.K., Brazil and South Africa. Further trials are planned in Japan and Russia.“To have just one vaccine enter the final stage of trials eight months after discovering a virus would be a remarkable achievement; to have three at that point with more on the way is extraordinary,” Health and Human Services Secretary Alex Azar said in a statement.Two other vaccine candidates began final testing this summer in tens of thousands of people in the U.S. One was created by the National Institutes of Health and manufactured by Moderna Inc., and the other developed by Pfizer Inc. and Germany’s BioNTech. 1215

A spokesman for Department of Justice special counsel Robert Mueller said the FBI has been informed of an alleged scheme in which a woman was offered payment to make false sexual misconduct charges against him.NPR reports multiple news organizations received information about the claims related to the alleged scheme. They have not been able to prove the accusations as true. 394

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