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SAN DIEGO (KGTV) — Even though Americans could start getting vaccinated in days, experts say people who get the shot will still need to wear masks and practice social distancing until scientists can answer a key question: whether immunized people can continue to spread COVID-19.The clinical trials by Pfizer and Moderna showed the two vaccines were about 95 percent effective, but what that really means is they were 95 percent effective at preventing COVID-19 symptoms.The trials did not measure whether vaccinated volunteers got infected without showing symptoms.That means “it is possible and conceivable” that immunized individuals could still be silent spreaders, said Dr. Christian Ramers of Family Health Centers of San Diego. “You’re not going to get sick, but you still get an asymptomatic case, pass it on to your grandmother and kill her.”Both the Pfizer and Moderna vaccines are injected into the arm muscle to stimulate production of antibodies. From there, the antibodies can quickly get to the lungs to fend off severe infection. But experts say the antibodies may have less access to the nose and throat, the primary entry points for the virus.Some studies have suggested that people without symptoms can still have high enough levels of coronavirus in their nose to infect other people.“The vaccine is doing something to prevent disease. We don't really know yet if it prevents transmission,” said Dr. Ramers. “So we have to fall back on all those fundamental things like distancing, masking and washing hands.”Still, experts say there are encouraging clues that vaccinated people may be less contagious. A study in October found antibody levels in the blood were similar to levels in saliva.AstraZeneca had volunteers in its trial test themselves for signs of infection and reported there were fewer asymptomatic cases. However, the company has not yet provided details and its vaccine relies on different technology than Pfizer and Moderna’s mRNA candidates.Until we know more, doctors say vaccinated people will have to keep wearing masks -- potentially until there we achieve herd immunity.“There is modeling to suggest that it will be summer until we reach the point where there are enough people vaccinated that this curve of new cases really starts to go down,” Ramers said.There’s a chance we could get good news before then. Both Pfizer and Moderna say they’ll start testing their volunteers’ blood to reveal if they got infected after vaccination.Pfizer plans to examine a subset of its volunteers. Moderna said it will analyze blood from everyone in the trial.Moderna said it will take several weeks to produce results. 2656

SAN DIEGO (KGTV) — Federal agents have been added to the investigation of a Kearny Mesa fire that gutted an off-roading business early Thursday morning.About 25 agents with National Response Team (NRT) of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) out of Los Angeles were requested by San Diego Fire-Rescue to assist with the probe.The NRT agents will arrive Friday and begin processing the scene at Off Road Warehouse Saturday, according to the ATF. They join other officials with ATF Los Angeles, SDFD, and the San Diego Police in the investigation. RELATED: Animals rescued as fire burns Kearny Mesa off road businessNRT personnel are called in to help investigate significant fire, arson, or explosion incidents, the ATF said. The fire comes five months after another fire ignited in November 2018. That fire, however, was reportedly ruled as an electrical fire.“ATF is committed to working alongside state and local law enforcement by bringing its resources to determine the origin and cause of this fire that resulted in a total loss for this business,” said Carlos Canino, the special agent in charge of ATF Los Angeles Field Division. “ATF will provide whatever is necessary to thoroughly investigate and provide answers.”Thursday's blaze was reported at about 1:30 a.m. at the ORW building (7915 Balboa Ave.) The fire caused an estimated .5 million in damages and the warehouse's contents were deemed a total loss. No injuries were reported. The fire also forced the evacuation of several cats and dogs at the nearby Balboa Veterinary Hospital. 1582

SAN DIEGO (KGTV) -- Father Joe’s Village and Connections Housing has been activated as rain is set to move in and cold temperatures continue throughout San Diego.The shelter, located at 1501 Imperial Avenue downtown, opens when the temperature is 50 degrees or below and there is a 40 percent chance of rain or exceptional weather conditions.The program, funded by the City of San Diego, provides food and shelter.CLICK HERE FOR TODAYS FORECASTThis is the second time so far this year that the shelter has opened. The first time the shelter opened was during the first winter storm of the season at the beginning of January.Click here for more information on the shelter.  685

SAN DIEGO (KGTV) - Extended construction work next to Friars Road has drivers wondering when the Mission Valley street will be back to normal.What is normally a four-lane road is now two, as SANDAG completes an million project. Crews are taking out a bridge with one track on it and replacing it with three bridges and four tracks. Two tracks will serve the Coaster and heavy freight trains. The other tracks are for the blue line trolley to La Jolla. “Every day that I have to pass this, it's just an eyesore,” said Katherine Whitley, who has spent two years driving through construction. “It clogs traffic. Everybody knows Friars Road has grown and grown and this isn't the right place for this to be.”RELATED: Gas main break prompts SR-163 closure in Mission ValleyBicyclists are also concerned about construction danger.“The cars going that way are passing me going 55 miles an hour about three feet away from me. So it feels pretty sketchy,” said Greg Zackowski.SANDAG said it is doing everything it can to minimize the impact of construction. The equipment can’t be put in the San Diego River because of the environmental impact. Moving gear on and off Friars Road would have delayed the project, SANDAG said.RELATED: Massive development proposed next to Fashion ValleyWithin six months, SANDAG hopes to have enough work done to move out most of the equipment. All of Friars Road should be finished by the end of 2019. 1446

SAN DIEGO (KGTV) - Having fun, San Diego? California ranked first in the U.S. for most fun states in a WalletHub survey.States were evaluated on factors that make fun a way of life. The top states offered a variety of activities for everyone to find a source of enjoyment.Cost was a consideration, too. WalletHub compared states for indicators of a good time that isn’t too expensive.Here’s how California breaks down, per capita: 438

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