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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) - Businesses are bracing for Governor Gavin Newsom's announcement Monday after San Diego has been on the state's watch-list since July 3, due to a surge in coronavirus cases.Newsom could announce indoor activities, like arcades, restaurant dining, movie theaters and museums will be shut down to contain the spread.This news comes as San Diego restaurants faced a volley of changes over the past four months."I think that the only thing that is constant is the change," Chief Brewing Officer Mike Hess said from his Imperial Beach brewery.He said the lucky thing about most of his locations is they have outdoor space, so they can shift more easily. "I called everybody Friday when we got word when it might change on Monday and everybody was like ‘Okay what do we need to do?’" He said sighing.READ RELATED: Mike Hess Brewing Company serving up a different type of alcoholSome of the changes he's made to be compliant with health orders have come at quite a cost. He said in one pay period his labor costs at the Imperial Beach location are three times the norm because they switched from bar service to table service and have to sanitize more often.Across town at Small Bar, Owner Karen Barnett said they shut down at the beginning of July and don't have any plans to reopen.'At the end of the day a business is a business, people are more important.' Barnett said they have been doing take out since the beginning of the pandemic, but never reopened for dine in.She said the small space at her business and horror stories of other restaurants and bars dealing with enforcing social distancing, wearing a mask and employees testing positive with the virus, helped her stick to her guns.On Friday, she posted this on Instagram, "After much consideration, Small Bar will be closing for the entire month of July (possibly longer). When the global pandemic was declared almost 4 months ago, we decided to quickly switch gears and continue to serve our community as thoughtfully and safely as possible. Unfortunately, Americans both near and far don't seem to be listening as closely to science as we are. We no longer deem our services "essential". We care about our community and feel the best move right now is to take a step back for a few weeks. In the meantime, we will be working on our footprint and how we can safely reopen later. We encourage more businesses to follow our lead to help flatten the curve, yet again. We will be working on ways to serve with as little contact as possible, but until that time we wish you all health and peace in the world. Take care."Monday we will find out if all restaurants will have to shut down inside dining, and wait at least three weeks until reopening. 2725

SAN DIEGO (KGTV) — County supervisors and health officials say the region's number of community outbreaks has exceeded its threshold prompting a pause on future business reopenings.Thursday, community outbreaks rose to eight from June 11-17. A community outbreak is considered three or more confirmed cases from the same place.The community outbreaks were linked to three businesses, two restaurants, one private residence, one campground, and one social club, according to Public Health Officer Wilma Wooten. RELATED: California requiring face coverings for most indoor areas"People are gathering and not using facial coverings," Wooten said. "When people come together and are within 6 feet of each other without facial coverings it's bound to happen."As things open up and people think that they can go back to the pre-COVID-19 existence, we cannot."Three of the eight outbreaks could fall off the county's metrics on Friday and bring the county below the threshold once again.Supervisor Nathan Fletcher said the following actions would be taken in response:The county will pause implementing statewide guidance on additional reopenings, not including Friday's planned reopenings of nail salons and other personal care services; andThe county would begin targeted enforcement on entities that are not following health orders.The locations of the county's eight outbreaks were not detailed. Fletcher said revealing which businesses had outbreaks could jeopardize contact tracing reporting and businesses cooperating. He added that the county is working with those businesses on their precautions and if there is a great enough risk, further details — including locations — could be released to the public.Fletcher said that the outbreaks were spread around the county, not directly linked to one another, and no deaths have been associated with them.RELATED: Mayor releases outdoor dining proposal in Little ItalyReferencing photos captured last weekend in downtown San Diego showing many visitors at bars not wearing masks or distancing, Fletcher said the county is counting on businesses to help enforce local orders."There is significantly less concern about individuals outdoors than indoors," Fletcher said. "We are really dependent on business owners to enforce the protocols in their businesses."Officials encouraged facial coverings, washing hands frequently, avoiding large private or public gatherings, and staying home when sick to fight future community outbreaks. 2486

SAN DIEGO (KGTV) - As a Hillcrest man showered in his apartment, an intruder was helping himself to a "priceless" pendant.The surveillance video that Ramon Castillo has seen countless times remains hard to watch."Scary and very disturbing," said Castillo.In late June on a Monday morning just before 9, Castillo was showering in his apartment on 3rd Avenue. What he didn't know know: he wasn't alone. When Castillo got out of the shower after 20 minutes, the screen door which had been locked was completely open. Surveillance video revealed why. In it, a man pauses at the door and somehow gets past the screen door, before quietly raiding the apartment. Among the items stolen were speakers and a safe from a bedroom closet. Inside the safe: cash, personal documents and jewelry, including a silver pendant containing the ashes of her mother. She passed away in 2015 from an accidental drug overdose."I can't replace that. It's the last thing of my mom and now I don't have anything," said Castillo.The thief who snatched it was in and out in about five minutes. He was seen driving off in a sedan. Castillo say the burglar had to have heard the shower running and went in anyways."He didn't think twice about it. I fear for the next person he goes after ... he might harm someone," said Castillo.If you do have information on the case, you're asked to call Crime Stoppers at 888-580-8477. 1399

SAN DIEGO (KGTV) -- As Santa Ana winds move out of the region, a freeze warning was issued for portions of San Diego County.The National Weather Service issued a freeze warning for the county's valleys and deserts from midnight through 10 a.m. Friday. Overnight temperatures dropped into the low 30s, with a few areas seeing temperatures in the mid- to upper 20s.The warning will affect cities including Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway.RELATED: Winter returns to Southern California mountains 528