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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 Seattle woman rinsed her sinuses with tap water. A year later, she died of a brain-eating amoeba.Her case is reported this week in the International Journal of Infectious Diseases.The 69-year-old, whose name was not given, had a lingering sinus infection. For a month, she tried to get rid of it using a neti pot with tap water instead of using sterile water, as is recommended.Neti pots are used to pour saline into one nostril and out of the other to irrigate the sinuses, usually to fight allergies or infections.According to the doctors who treated the woman, the non-sterile water that she used it thought to have contained Balamuthia mandrillaris, ?an amoeba that over the course of weeks to months can cause a very rare and almost always fatal infection in the brain.Once in her body, the amoeba slowly went about its deadly work.First, she developed a raised, red sore on the bridge of her nose. Doctors thought it was a rash and prescribed an antibiotic ointment, but that provided no relief. Over the course of a year, dermatologists hunted for a diagnosis.Then, the left side of the woman's body started shaking. She'd experienced a seizure that weakened her left arm. A CT scan showed an abnormal lesion in her brain that indicated she might have a tumor, so doctors sent a sample of tissue for testing.Over the next several days, additional scans revealed that whatever was happening in her brain was getting worse. The mass was growing, and new lesions were starting to show up.Finally, a neurosurgeon at Swedish Medical Center, where the woman was being treated, opened her skull to examine her brain and found that it was infected with amoebae.The US Centers for Disease Control and Prevention rushed the anti-amoeba drug miltefosine to Seattle to try to save the woman's life, but she fell into a coma and died.According to the CDC, most cases of Balamuthia mandrillaris aren't diagnosed until immediately before death or after death, so doctors don't have a lot of experience treating the amoeba and know little about how a person becomes infected.The amoeba was discovered in 1986. Since 1993, the CDC says, there have been at least 70 cases in the United States.As in the Seattle woman's case, the infections are "almost uniformly fatal," with a death rate of more than 89%, according to the doctors who treated her and the CDC.The amoeba is similar to Naegleria fowleri, which has been the culprit in several high-profile cases.In 2011, Louisiana health officials warned residents not to use nonsterilized tap water in neti pots after the deaths of two people who were exposed to Naegleria fowleri while flushing their nasal passages. An official urged users to fill the pots only with distilled, sterile or previously boiled water, and to rinse and dry them after each use."Improper nasal irrigation has been reported as a method of infection for the comparably insidious amoeba," the doctors say in the research paper about the Seattle woman. "This precedent led us to suspect the same route of entry for the ... amoeba in our case."The woman's doctors say they weren't able to definitely link the infection to her neti pot, as the water supply to her home was not tested for the amoeba. They hope her case will let other doctors know to consider an amoeba infection if a patient gets a sore or rash on the nose after rinsing their sinuses.Kristen Maki, a spokeswoman for the Washington State Department of Health, said in an email that "Large municipal water supplies ... have robust source water protection programs" and treatment programs, and she noted that "Well protected groundwater supplies are logically expected to be free of any such large amoeba" such as Balamuthia. 3746

A San Diego teenager will use her family's Spring Break trip to Washington, D.C., to advocate for stronger gun control laws.Faith Campbell, a Sophomore at Frances Parker School in Linda Vista, already has a meeting set up with Representative Susan Davis to discuss gun reform. She also has a stack of hand written letters from herself and her classmates to deliver to other area Congressmen and women."A letter is really powerful," Campbell says. "It shows that someone took the time out of their day to write specifically to this person."Campbell says she wrote a letter to Representative Davis after the shooting at Marjory Stoneman Douglas High School in February. Rep. Davis wrote back asking is she would like to meet.Campbell took part in last month's March for Our Lives in San Diego, joining thousands of others to call for stricter gun control laws. But she says she doesn't want the momentum to stall now that the protests and marches are over.Now, Campbell is inviting all of her classmates and fellow teens to write letters. She says she'll deliver them while she's in DC."It doesn't really matter how many letters I get," she says. "It's just the fact that people are writing."She says she'll take any letter written by a teen if they can get it to her by this Friday, April 13th. The letters can be dropped at her father Richard Campbell's office, Procopio Law Firm, at:525 B. Street, Suite 2200San Diego, CA 92101  1452

A suburban Atlanta police officer resigned after his department said he used foul language and inappropriate tactics during the arrest of a 65-year-old grandmother during a traffic stop, recorded on a police dashboard camera.Alpharetta Officer James Legg had been called in as backup during a May 4 traffic stop because the Lyft driver would not sign a ticket and refused another officer's order to get out of her car, officials said.In a letter to Alpharetta Public Safety Director John Robison released Friday, Legg said he felt he behaved appropriately and followed his training."I judged her actions to be passive resistance and used very limited force to end a multiple minute encounter with the suspect," he said. "Maybe I should not have used profanity, but its immediate effectiveness is not questionable and I do believe I acted reasonably under the circumstances."Dashcam video showed Legg pointing at the driver and shouting, "You're not in charge. Shut the f---- up and get out of the car." 1010

A political action committee is putting up a billboard in a strategic place for President Trump to see when he visits Mar-a-Lago.The message will say: “Impeachment Now, Make America America Again!”According to Mad Dog PAC, they are installing the billboard along East Shannondale Road. This location is near Palm Beach International Airport and Southern Boulevard, a route the president frequently takes during his trips to the "Winter White House."According to the PAC's website, the group says the "Impeachment Now" billboard will be up from March 19 to April 15.This isn't the only one of its kind going up in the United States, Mad Dog PAC's website says they currently have other "Impeachment Now" billboards already up in Ohio, Virginia, Pennsylvania. One in California was on public display from Feb. 5 to March 4, says the PAC's site.The left-wing group has other politically-motivated billboards placed across the country for the 2018 mid-term elections that target Republicans. 1015

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