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SAN DIEGO (KGTV) — Nearly three-quarters of the students in San Diego County are currently learning from home, and those numbers don’t make a lot of sense to MIT professor Martin Bazant.Bazant is one of the creators of the COVID-19 Indoor Safety Guideline. The free online tool simulates the fluid dynamics of respiratory droplets in various kinds of rooms to show users the risk of different indoor environments.“If you run the numbers for a typical classroom, especially if the students and the teachers are wearing masks, then the amount of time in the room can be very significant,” Bazant said. “Essentially those people could spend a week in the classroom and not have a problem.”Bazant says the six-foot rule that has largely determined which businesses can stay open is overly simplistic. In some cases, he says the rule creates a false sense of security. In other situations, he says it causes the closure of businesses or schools that could safely operate.“If you place nursing home beds six feet apart in a shared room, they are absolutely not safe,” he said. But he said well-ventilated classrooms, with teachers and students in masks, are another story.“It's only the United States where we follow the six-foot rule. That's given by the CDC. The World Health Organization all along has been saying one meter, which is about three feet. If you simply followed the one-meter rule, all our schools would be open, as they are in most of the world right now,” he said.Bazant and his colleague John Bush said they set out to design a tool that would reveal the risk of transmission based on science, not guesswork.Users start by selecting a room type, like a classroom or an airplane. From there, they can control a wide array of variables to dial in the risk, like the room size, the ceiling height, and the ventilation and filtration systems.From there, users can further tune the model by human behavior. How many people are in the room? Are they whispering, shouting or singing? How many are wearing masks?Mask usage is a critical component, Bazant says. The model quickly reveals the challenges of maskless activities in rooms with poor ventilation. Put five people without masks in a 400 square foot room with closed windows, and it becomes unsafe after 33 minutes.Bazant says studies on super spreader events show in indoor environments, the distance from an infected person doesn’t matter. Infected droplets spread and mix throughout the room like second-hand smoke from a cigarette.But with masks trapping droplets and diverting them upwards like a chimney, an environment like an airplane could be safe for several hours, according to the model. With more than 95% of the passengers and crew wearing surgical masks, a Boeing 737 could support 200 people -- around full capacity depending on the configuration -- for 18 hours. 2850

SAN DIEGO (KGTV) — One person was shot Sunday outside of a College Area smoke shop, according to police.It wasn't immediately clear what led to the shooting, but San Diego Police confirmed that a 20-year-old man had been shot just before 5:30 p.m. in the 5900 block of El Cajon Blvd., outside of Aztec Smoke & Vape Shop.The victim was hit in the leg and chest and taken to a nearby hospital, but their condition was not clear.The area was closed by police for the investigation.10News is monitoring this breaking news. Please check back for updates. 561

SAN DIEGO (KGTV) - Nearly four thousand kids in San Diego County have tested positive for lead poisoning over the past decade, and more than 130,000 have missed crucial tests, according to a new report from the California State Auditor.State law requires all 1-and-2 year old children on Medi-Cal to get lead testing. The auditor's office says that's not happening.According to the study, 61% of the tests that should have happened since 2009 were missed. In San Diego, that number is 59%. Specifically, kids in San Diego missed 130,657 of the 220,782 tests that should have been administered.Meanwhile, 44,418 kids across the state tested positive for elevated lead levels. In San Diego, 3,395 tested positive.Local doctors say it's problematic because lead poisoning is nearly impossible to detect without proper testing."Unless you screen kids, they are almost always asymptomatic," says Dr. Kenneth Morris, the Medical Director of the Children's Primary Care Medical Group. "You have no idea until you do the routine screening."Dr. Morris says infants are especially prone to ingesting lead, which can cause developmental problems throughout life."They're crawling on the floors, and they're putting their hands in their mouth. It's just that much easier for the lead to get into their system," he says.Morris says access is a problem for many families on Medi-Cal. They go to their doctor's office for routine check-ups and appointments, but can't get to the follow up lab visits for testing."If you have to refer a child out to a laboratory, it becomes that much more challenging. Because then it falls on the family to be able to get to a lab or hospital to get their blood drawn and get the test completed," he says. "That can be a real challenge for under-served families. To get to us, they have to get a friend to drive them or take the bus."Morris says many offices are now getting basic testing abilities, but as long as families have to go to multiple locations, this will remain an issue.See the full report from the State Auditor's Office here. 2069

SAN DIEGO (KGTV) - North and South Korea made history Friday by agreeing to officially end the peninsula's civil war. The move brings back chilling memories for Korean War vets in San Diego. 10News reporter Jennifer Delacruz sat down with one of those vets ahead of an Honor Flight to the Washington, D.C. next week. Bob Weishan's trophy room takes him back to a different time -- a time of conflict and destruction."It was interesting," said Weishan. "It's a whole different world that they live in."But when the 87-year-old Korean War veteran looks back today, it's a little different. "It should have happened a long time ago."The resolution of peace between North and South Korea puts even more meaning into the 15 months he was there fighting for freedom.   "You had two options," said Weishan. "One was stay in the trucks and burn to death, or climb out of the trucks and get shot."One of his most haunting memories was watching 100,000 refugees fleeing for their lives. "They were carrying everything they owned with them."Having been there in the trenches, he knows how much his agreement means to those families who left and those still there today. "For the North Koreans, I think they're on their knees every night with prayers that this is a success and that this doesn't fail because it gives them a way out."Although it's still early on, he says it's a step in the right direction. "It's a little bit of hope," said Weishan. "At least they're talking. And if something comes out of it, it could be good."Weishan joins about 25 other vets who leave for their Honor Flight on May 4th.  1670

SAN DIEGO (KGTV) - One person was killed in a chain-reaction crash on Interstate 805 in the South Bay that forced lane closures and led to a heavy traffic backup during the Wednesday morning commute.Shortly after 11:30 p.m. Tuesday, the California Highway Patrol reported a crash involving a Nissan pickup truck colliding with a Caltrans truck that was working along the side of northbound I-805 near Bonita Road.CHP officials determined that a Toyota Yaris struck the pickup, causing it to slam into the back of the Caltrans truck, which was hauling asphalt.CHECK TRAFFIC CONDITIONS10News learned the Nissan's driver died at the hospital after sustaining injuries from the wreck.Yaris' driver, a 29-year-old man, was arrested on suspicion of DUI and vehicular manslaughter.No other injuries were reported, and CHP officials said the crash is under investigation.The crash and clean-up led to the closure of at least two lanes on northbound I-805 at Bonita Road. The onramp from Bonita Road to northbound I-805 was also shut down.The closures caused a traffic jam that extended south past Palomar Street in Chula Vista.To alleviate some of the gridlock, the CHP opened the HOV lanes to all vehicles. 1207