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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) — New studies are showing that one of the most important risk factors for COVID-19 is weight, including for children.People who are obese are more than twice as likely to wind up in the hospital with COVID-19 as those with normal weight, and 48 percent more likely to die from it, according to a study last month that looked at hundreds of thousands of patients.“Some people have made the argument that the deaths from COVID are just in people with preexisting conditions. Well, this is a preexisting condition that affects a third of the U.S. population in the obese range and another third in the overweight range,” said Dr. Christian Ramers of Family Health Centers of San Diego. “So it’s extremely common.”More than 71 percent of adults are either overweight or obese, according to the CDC. Adults are considered overweight if their body mass index is 25 or higher, and obese if their BMI is 30 or higher.The U.S. has one of the highest rates of obesity in the world, and some experts have theorized it’s one of the reasons why the virus has hit our country harder than others.The risk extends to children as well, who are generally spared from severe cases of COVID-19. Among children hospitalized with the disease, 38 percent had obesity, by far the largest risk factor, according to a CDC study.But what is it about fat that makes the virus worse?There are several theories. People who are obese have blood that clots more easily, one of the main ways COVID-19 kills. Fat cells secrete tiny proteins that cause inflammation, another huge problem with COVID patients that can spiral out of control in what’s called a cytokine storm.Overall, obese people have weaker immune systems.“The theory is that the fat is taking over in certain parts of your body that normally are producing white blood cells,” said Dr. Marsha Blount of Sharp Rees-Stealy Medical Center.Extra fat on the abdomen makes it harder to get air into the lungs, exacerbating conditions like pneumonia. And the extra weight makes it harder to use a ventilator, said Dr. Ramers.On top of all that, people with obesity frequently have other underlying conditions.“Hypertension, diabetes, obesity, fatty liver -- these things are all associated with each other,” Dr. Ramers said. “What we’ve seen is that each of them is related to a poor outcome with COVID.”Studies have shown that simply being overweight increases the risk of COVID-19. A study of nearly 17,000 hospitalized patients in the U.S. found that 29 percent were overweight and another 48 percent were obese.The encouraging news, according to Dr. Blount, is that losing just 5 percent of your weight can have significant benefits. Dr. Blount teaches other physicians how to talk about weight loss with a technique called motivational interviewing.“That 5 percent has been proven time and time again to decrease the risk of getting diabetes. It decreases breast cancer risk for females. It lowers triglycerides and improves HDL, which are different lipid numbers and that thereby decreases your risk of stroke and heart attack,” she said.It can also reduce blood pressure, another major risk factor for COVID, suggesting a little weight loss can go a long way. 3215

SAN DIEGO (KGTV) - One driver was arrested after video of a road rage incident in Oceanside made its way into CHP's hands.Two drivers, one in a gray Ford Explorer and the other in a gray BMW convertible, were involved in the February 15 incident on eastbound State Route 78 in Oceanside, according to California Highway Patrol officers.Officers responded to a report of a non-injury, hit-and-run collision just before 4:30 p.m. near the College Blvd. exit. Officers arrived and found the Explorer on its side on the center median while the BMW reportedly fled.RELATED: Road Rage Crisis: Violence on the RiseWhile investigating, officers were made aware of a video recorded by a witness.The video showed the driver of the BMW, identified as 33-year-old Kevin McCall, left his vehicle to berate the driver of the Explorer, identified as 23-year-old Andrew Branch, who was still inside his vehicle, according to CHP.Officers said McCall spit at Branch before returning to his BMW. Branch is then seen driving into the center median and accelerating into the BMW, narrowly missing McCall.Sideswiping the BMW caused the Explorer to overturn onto its side. McCall then drove away, officers said."It was pretty shocking. It was pretty shocking," said CHP Officer Mark Latulippe. "This was an event that obviously they were embroiled in. it got way beyond what I assume either of them wanted to get to but it did." RELATED: Dad, kids nearly run off I-8 in road rage attackThe person who recorded the now-viral video was in disbelief:"First I was recording just because he was swerving into the left lane. But as you can see it did take a crazy turn. I cannot believe I witnessed such a crazy accident. Just because he was mad he wasn’t able to cut someone off. After the incident, the convertible man took off about 15-20 feet, then parked, and decided to walk back. I was so scared and nervous, I drove off as safely as I could." 1965

SAN DIEGO (KGTV) -- Police have released pictures of a man accused of shooting and killing a 27-year-old man in the Midway District in late February.Police say Ernesto Castallenos Martinez, 41, shot and killed Alexander Mazin in a parking lot behind the 24 Hour Fitness on the 3600 block of Midway Drive.Following the shooting, police were led to the intersection of 30th Street and Upas Street where an hours-long standoff took place.RELATED: Police identify Midway District shooting victim, suspect of North Park standoff?After SWAT teams entered an apartment in the area, they didn’t find Martinez. Police say they believe Martinez is an acquaintance of Mazin.Anyone with information is asked to call San Diego Police at 619-531-2293 or the Crime Stoppers anonymous tip line at 888-580-8477.Crime Stoppers is offering up to a ,000 reward for information that leads to an arrest. 891

SAN DIEGO (KGTV) -- Police are searching for a suspect in a Serra Mesa stabbing that left two people in critical condition Saturday night.Officers responded around 7:51 p.m. to a call of a brawl outside of a house party on the 8400 block of Neva Avenue, police said. At least two people were located with stab wounds to the torso.A resident told 10News described hearing people fighting outside his home. He tried to intervene but the suspect disappeared.“I rushed out to see if I could stop them from doing anything and by the time I think they already left the scene," said Turk Sapta.The unidentified victims were transported to a local hospital in critical condition, police said.No description of the suspect or suspects was given at this time.Stay with 10News for updates to this developing story. 813