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SAN DIEGO (KGTV) — As temperatures warm up, there is some early research suggesting air conditioning units could increase the risk of spreading COVID-19.One team of researchers swabbed several kinds of air conditioning units and found traces of the virus on one out of every four samples.One of the authors, University of Oregon professor Dr. Kevin Van Den Wymelenberg, said the research “does give us some pause.”Air conditioning units bring in little outside air, particularly when temperatures are very hot, posing a risk that viral particles could be recirculated into rooms, Van Den Wymelenberg said.However, just because the study found traces of the virus in A/C units, it doesn’t prove people can actually get sick from the contaminated air because it’s not yet clear how many viral particles it takes to infect someone, he noted.“Nobody knows what that minimum threshold is so we need to take as many precautions as possible,” he said.Dr. Edward Nardell, a professor in the Departments of Environmental Health and Immunology and Infectious Diseases at the Harvard T.H. Chan School of Public Health, said air conditioning units can generate air currents that can carry large particles farther, similar to what researchers found contributed to the spread of the novel coronavirus disease in an air-conditioned restaurant in Guangzhou, China."You are not socially distanced as much, but you're re-breathing the same air that someone else just exhaled," Nardell said. "We call it rebreathed air fraction, and if someone is infectious, often asymptomatic, you're going to be rebreathing their small particles."This week, a group of 239 scientists from 32 countries asked the World Health Organization to update its COVID-19 guidance to reflect that the virus is airborne.On Thursday, the WHO released updated guidance acknowledging that airborne transmission can’t be ruled out, but stopped short of confirming that the virus spreads through the air.Instead, the WHO said the virus primarily spreads through droplet transmission, where larger particles come out of an infected person’s mouth, then fall quickly to the ground or onto surfaces. In airborne transmission, the particles stay floating for a long time.“I think they’re underweighting the importance of this airborne route based on the best available information,” said UC Berkeley Professor Emeritus William Nazaroff, one of the signatories of the letter to the WHO.He said in a poorly ventilated room, particles might linger for 30 minutes to an hour.Scientists say one of the best ways to protect yourself is to open windows, to increase the circulation of fresh air.Scientists say upgraded air filters in AC units and standalone air purifiers could also help.Germicidal lamps may also be effective, Nardell said. The technology is almost 100 years old, and has been proven effective in protecting against tuberculosis infection.The lamps, which shine ultraviolet light, are set up to shine horizontally, high up in the room to kill floating pathogens.Nardell said the technology can be deployed cheaply and easily in a number of settings.Additional reporting by Lauren Rozyla at WFTS 3159

SAN DIEGO (KGTV) - As San Diego doctors sound the alarm on potential dangers of motorized scooters, some victims are now turning to personal injury lawyers.A woman walking downtown was recently hit by a scooter and left with ,000 in medical bills.Unfortunately, a personal injury attorney tells 10News in cases like this, victims will likely be on their own.RELATED: Mother, daughter seriously injured in scooter crash"The scooter operator is responsible for your injuries. Now, does that mean you’re going to be compensated for them? Probably not," said Mike Bomberger with Estey & Bomberger. "Most scooter operators don't have insurance to cover them for the operation of the scooter."While scooter riders must have a driver's license, they are not required to have insurance. Bomberger says it's also unlikely the scooter companies would be held liable in accidents.RELATED: Electric scooter rider injured in crash, cited for DUI“The waivers and disclaimers you sign are very, very detailed in favor of the company, almost under no circumstance can you go after company unless there’s a malfunction of the scooter itself," said Bomberger.While attorneys are advertising they can help scooter victims, Bomberger believes compensation will be few and far between.“We’ve gotten 10-12 calls and have only taken one case; they were hit by a car," said Bomberger.RELATED: Police crack down on scooter riders without helmetsDowntown resident Jonathan Freeman has been a staunch opponent of scooters coming to San Diego. His dog was hit and he's had close calls himself.“I have elderly neighbors; they tell me they don’t want to walk. If they’re hit by a scooter and break their hip, it’s a death sentence," said Freeman.He's called on the city to do more to hold people accountable for riding illegally on sidewalks and the promenade downtown.RELATED: Local emergency rooms report 'daily visits' for scooter injuriesDr. Jeff Sugar, an urgent care doctor with Sharp Rees-Stealy Medical Group, says they've seen a range of injuries from head lacerations and sprains to contusions and fractures. He says urgent care departments report daily visits by patients injured using electric scooters and rental bikes.Michael Sise, M.D., trauma surgeon and chief of staff of Scripps Mercy Hospital San Diego, said this: 2319

SAN DIEGO (KGTV) -- Authorities eradicated a massive illegal marijuana grow operation discovered near a popular trail in the Rancho Pe?asquitos area.According to Drug Enforcement Administration officials, San Diego police officers were called out to an area of the Del Mar Mesa Preserve on Tuesday regarding a homeless encampment. That’s when they discovered more than 2,000 marijuana plants.The plants were 5- to 7-feet tall and were ready to be harvested. The street value of the crop is estimated to cost as much as .5 million, the DEA said.The plants were hidden below the canopy of the natural vegetation.“The way that it was set up, it was obvious people were living on that property, would lead us to believe, if we had to make a guess, it was most likely cartel-related,” DEA officials said.They called it a sophisticated operation, adding it was rare to see an illegal grow of its size growing in a city so close to homes.“In this case, we think it's more likely they found a fire hydrant or some sort of a city water source that they were able to tap into,” DEA officials said. “We couldn’t find that in this case, but we think that’s the most likely scenario.”Authorities said there was also an extreme fire danger associated with the grow. They found trash in the vicinity, as well as two propane tanks and open flame burners for cooking in an area with tall, dry vegetation.Authorities have not found anyone connected to the illegal operation. They are asking the community with any information to come forward. 1534

SAN DIEGO (KGTV) — Businesses in the Gaslamp District were evacuated Saturday due to a natural gas leak. San Diego Fire crews evacuated several business in the area of Fifth Avenue and E Street in the heart of the Gaslamp District. All streets within a one block radius, from F St. to Broadway and Fourth Ave. to Sixth Ave., have been blocked off. Police are asking pedestrians and drivers to avoid the area.No injuries were reported. No estimation as to how long the businesses would remain evacuated was immediately available. 10News is monitoring this breaking news story. 583

SAN DIEGO (KGTV) — County officials closed a portion of La Jolla's coastline after a sewage spill Friday morning.The closure was issued for the area of Playa Del Norte in Windansea, near the 7000 block of Neptune Pl., after a sewage spilled before 9:30 a.m.Seven year La Jolla resident Marc Hirschfield said he was walking his dogs Saturday morning when he noticed the yellow warning signs dotting the beach and asked lifeguards what happened. He said they told him "there was a manhole cover that overflowed and raw sewage spilled into the ocean."Lifeguards told 10News it was a storm drain to blame in the same area.The spill has been contained, according to the County Department of Environmental Health, but there still may be impacts to water quality after 130 gallons of sewage entered the beach area.Warning signs have been placed in the area until samples of the ocean water indicate the water is safe for recreational use. It's not clear how long the area will remain closed.Some beach-goers ignored the signs, others, like surfer Cole Reiner just didn't see them. "Well I went out into the water. I mean contaminated doesn’t sound great, but I was out there and it says may cause illness so that’s not great," he said. Lifeguards couldn't say when the beach would reopen. As of 4:30p.m. the county said the beach was still closed."City life guards recommend 72 hours so for me it’ll probably be 48," HIrschfield said. 1435

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