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SAN DIEGO (KGTV) – The Marine Corps Air Station Miramar said a suspicious letter received by the post office was found not to contain anything harmful Tuesday.MCAS originally sent out a tweet stating that the post office identified a letter around 1:45 that was determined to be suspicious.First responders were called and took “appropriate actions.” Just after 4:30 p.m. MCAS tweeted that the parcel was screened and did not contain anything harmful.MCAS added that the post office is expected to resume normal operations Wednesday.#Update: The parcel was screened and did not contain anything harmful. The @MCASMiramarCA Post Office will resume normal operations tomorrow.— MCAS Miramar (@MCASMiramarCA) March 7, 2018 727

SAN DIEGO (KGTV) - Surgeons at UC San Diego are using new technology that offers more options for patients who have complex thoracoabdominal aortic aneurysms. UC San Diego Health System is the first on the West Coast to use Dynamic Morphology Correction, a type of 3D imaging. It allows surgeons to compare scans taken before the procedure to real-time pictures during the surgery.Dr. Mahmoud Malas, Chief of Vascular and Endovascular Surgery at UC San Diego, says this type of technology uses minimal iodine contrast which lessens the chance of kidney problems for 25 percent of patients dealing with aneurysms.The data from this technology helps surgeons across the country.Dr. Malas adds, " They create prediction models that helps future surgeons perform procedures more accurately." 795

SAN DIEGO (KGTV) - The coronavirus pandemic is preventing many seniors in skilled nursing facilities from seeing their families. UC San Diego students are working to help combat their loneliness with their Sunshine 4 Seniors project. Students would spend their weekends visiting seniors as part of a volunteer project before classes were canceled at UC San Diego. The pandemic halted their visits. "We came up with this project, which was creating cards for seniors at St. Paul Senior Services," says student Olivia Michael. The goal of the project is for students to "step in and fill the loneliness and isolation that the senior citizen communities are feeling, especially during this pandemic," says Morgan Montoya. The students say loneliness in seniors can have damaging effects on the brain. "Olivia and I are near-cognitive science majors," says Montoya. "Our majors really helped us to understand the problems that loneliness poses. With senior citizens having an abundance of isolation and loneliness, it can actually deregulate the brain and cause a progression of Alzheimer's or depression."The Sunshine 4 Seniors project launched nearly a month ago. So far, more than 200 cards have been sent to seniors in skilled nursing facilities. The students say there are thousands of seniors who are not allowed to see their loved ones during this time. They hope to spread some sunshine to as many seniors as they can. "The goal is just to get as many people writing cards as possible," says Michael. "Any means that you have to do it, I just encourage you to get started." 1586

SAN DIEGO (KGTV) — The back-to-back announcements of promising clinical trial results from Pfizer and Moderna may usher in a new era for vaccine technology.Both companies have candidates that rely on a new kind of vaccine strategy: RNA. Preliminary data show both candidates are more than 90 percent effective.On the surface, the vaccine candidates look like any other you’ve taken. They work by training your body to build up defensive weapons against a virus, like antibodies and T-cells.But instead of training your body by introducing a killed virus or a fragment of a virus, the vaccines from Moderna and Pfizer introduce a set of instructions called messenger RNA enclosed in a little blob of fat.“The key concept of RNA is that they’re messages, and they’re meant as short-term messages,” said Dr. Shane Crotty of the La Jolla Institute for Immunology.Crotty said there are 5,000 to 10,000 messages within a cell at any given time.Once administered, the mRNA in the vaccine instructs some of your cells to make the coronavirus’ signature spike protein. The spike protein on the surface of the coronavirus allows it to infiltrate and hijack cells.Even though the spike protein is just one of about 25 genes the virus has, preliminary results from the clinical trials suggest it is enough material to train the immune system without making the recipient sick.Crotty likened the process of training the immune system to spotting a sedan. If the coronavirus is a car, the spike protein might be the door.“There's no way that car door could turn into a whole car, but it's enough of a piece of a car for your immune system to recognize that car if it saw it again,” he said.Scientists started by sequencing the virus’ DNA from a sick patient, then encoding that genetic sequence into an mRNA instruction molecule that can be read by the manufacturing part of cells.From there, Dr. Crotty said it’s a bit like the messenger app Snapchat.The mRNA gets injected into the body, sending temporary instructions to your cells that last for a while, then disappear. mRNA does not genetically modify cells, he stressed.“They’re around as messages for some period of time and then they go away, and the cells get back to their normal job of reading their own messages instead of reading the messages you’re injecting in the vaccine,” he said.The concept has been around since the 1990s, but there are currently no RNA vaccines on the market for any pathogen, so Dr. Crotty said it’s hard to estimate how long their protective effects will last.Some vaccines offer a lifetime of protection, like the measles vaccine. Others offer decades of protection. The flu vaccine only lasts about six months.Dr. Crotty said the length of protection depends on how fast the virus mutates and how long the immune cells survive in the body.But even if the COVID-19 vaccine turns out to need an annual update, he’s optimistic. The best feature of RNA vaccines is that they can be quickly reprogrammed.Both Moderna and Pfizer are still in their Phase 3 trials, but they expect to finish them by December. Together, they estimate they’ll have enough doses for about 35 million people by the end of this year, primarily for healthcare workers and high-risk individuals. 3250

SAN DIEGO (KGTV) -- The former Imperial Beach PTA president who’s accused of embezzling thousands of dollars has pleaded guilty. Kaitlyn Birchman was supposed to have a preliminary hearing Thursday morning, but she’d already pleaded guilty to forgery of a financial institute. She is set for sentencing on April 3. RELATED: Former Imperial Beach PTA president charged with embezzlementBirchman served as the PTA president at Imperial Beach Charter School from 2016 to 2018. During that time, prosecutors say she stole at least ,000 from school membership fees, book drives and holiday fairs. 603