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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 US service member and a member of the UK armed forces were killed in an improvised explosive device attack in the Manbij area of Syria on Thursday.A US official with knowledge of the initial reports from the battlefield told CNN the American had been killed.The UK Ministry of Defence confirmed the British death in a statement saying the soldier was embedded with US forces on a counter ISIS operation when the incident occurred."The family has been notified and our thoughts are with them at this difficult time," the British statement continued.Two members of the US-led coalition in Syria were killed and five were wounded in the attack, the coalition said. The official said that multiple vehicles were involved in the IED incident.The coalition said details about the incident are being withheld pending further investigation and that the names of those killed will be released "at the discretion of the pertinent national authorities."The US maintains about 2,000 US troops in Syria, who mostly work with local allies fighting ISIS in Syria.President Donald Trump said Thursday that the US would "be coming out of Syria like very soon," just hours after the Pentagon highlighted the need for US troops to remain in the country for the immediate future.Chief Pentagon spokesperson Dana White told reporters that "important work remains to guarantee the lasting defeat of these violent extremists" in the country.The-CNN-Wire 1440

A massive cloud of Sahara Desert dust is blanketing the Caribbean as it heads toward the U.S. with a size and concentration that experts say hasn’t been seen in half a century. The thick dust cloud, known as the Saharan Air Layer, is making a 5,000 mile trip from the northern Africa desert to North and Central America along the east to west Trade Winds along the equator. The Saharan Air Layer is between 5,000 and 20,000 feet above the Earth's surface, and dust plumes travel over the Atlantic Ocean several times a year between spring and fall. This year's dust plume is thicker than normal, the concentration of particles in Puerto Rico are the highest in decades. Air quality across most of the Caribbean region fell to record “hazardous” levels Monday and experts who nicknamed the event the “Godzilla dust cloud” warned people to stay indoors and use air filters if they have one. 896

A public housing building in Cleveland Heights, Ohio has become a target for at least one scammer posing as a nurse and offering free cancer screenings. But instead of giving people help, she walks away with personal information.One victim, Azzizat Crumble said she was flipping through the channels on Saturday when she heard a knock on the door."Opened the door and she said she was from Stephanie Tubbs' and they were going around doing cancer screenings," Crumble said.The woman was dressed in scrubs and even offering an incentive.  "If we were to agree to it, we would get a 0 gift card to Walmart in the mail," Crumble said.Crumble said it's not uncommon to see nurses in her assisted living building, so she agreed."She was like, 'Before we do it, I am going to need to see your ID and Medicaid card.' So I went and got it and she wrote the information down in a notebook," Crumble recalled.The woman then proceeded to swab Crumble's cheeks and was on her way within 10 minutes."And then she was like, 'Okay, well you will receive your card within five to seven business days," said Crumble.Crumble said she didn't think anything of it until she saw a sign on a bulletin board in the hallway of her complex. "Scam alert: If anyone comes to your door asking for your personal information, call the police immediately," Crumble said the sign read.Crumble said her social security number was on the Medicaid card she gave the woman, so she has since been monitoring her credit activity.Police say this is an on-going investigation. They believe at least four people were targeted, two of which handed over their personal information. Police say they do have a person of interest and potentially two others.  1848

A small sinkhole opened in the White House lawn on Tuesday, causing a section of the lawn to be roped off. The sinkhole is in the north lawn of the White House. White House groundskeepers placed a wooden board over the sinkhole.  247