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SAN DIEGO (KGTV) - In an effort to drive environmentally-friendly urban commuting, bike and scooter sharing companies have rolled into San Diego County — creating some headaches along the way.With the travel alternative, though, has come a glimpse into a greener future for congested roadways.Though in San Diego since February, ofo officially joined the city's expanding field of dockless bike and scooter options Monday. The company joins competing options Bird, LimeBike, MoBike, and DecoBike. RELATED: Thousands taking advantage of dockless bikes, scooters"Having ofo in San Diego is a boon for our region,” Colin Parent, Executive Director for Circulate San Diego, said. "As transportation advocates, we welcome ofo to San Diego as an innovative solution to meeting San Diego’s environmental goals and providing transportation options."Riders simply download the ofo mobile app, scan the QR code on the bike to unlock it, and they're on their way. Rides run an hour, according to ofo. When finished, riders safely — and legally — park the bike and manually lock it to end the trip.Safely and legally means placing the bike out of the way of traffic and people walking or biking themselves.RELATED: Unique bike app Limebike rolls out in Imperial BeachThe Boardwalk stretching from Mission Bay to Pacific Beach is a prime example of both the pitfalls and ease of use, as users glide along but also run into congestion among walkers, runners, and skateboarders.Witnesses have told 10News they've seen scooter riders not wearing a helmet and people riding where they're not supposed to, in addition to bikes left only to block others.San Diego Police said the dockless bike and scooter movement is so new they haven't had the ability yet to issue citations and track riders.How do you feel about San Diego's bike- and scooter-sharing boon? Vote in our 10News poll below: 1942

SAN DIEGO (KGTV) — In their push to reopen schools, some political supporters of President Donald Trump have cited COVID-19 research from a group of San Diego scientists, claiming it’s evidence we could be close to herd immunity from the virus.But one of the authors of that research says that conclusion is way off.One of the most prominent supporters of the herd immunity conjecture is Dr. Scott Atlas, a neuroradiologist and senior fellow at Stanford University’s Hoover Institution who became an adviser to President Trump this month.“There’s a pretty good chance that herd immunity requires way less infections because of existing immunity out there,” Atlas said in a livestream conversation with San Diego County Supervisor Jim Desmond. “It actually may have already been reached in places like New York. We don’t know, but it’s possible.”Herd immunity is the level of protection needed to effectively stop the virus from circulating, thought to be about 70 percent of the population. The “existing immunity” to which Atlas is referring has to do with T cells.“It's just a misunderstanding of the science,” said Dr. Shane Crotty, a virologist at the La Jolla Institute for Immunology who co-authored the groundbreaking research on T cells in June.Crotty and his colleagues found that 50 percent of people unexposed to the novel coronavirus had T cells that could recognize it. Scientists refer to this as cross-reactive T cells, and the study was replicated in other countries.Proponents of the herd immunity theory take the number of people infected with the coronavirus, add the number of people with T cells that can recognize the virus, and come up with a number around the herd immunity threshold of 70 percent. But the math doesn’t work that way, according to Crotty, in part because T cells only kick in once a virus has hijacked cells, meaning T cells alone can't stop a pathogen in its tracks.“We’re not saying those 50 percent of people have protection like they’ve already had the virus,” Crotty said. “We’re saying those 50 percent of people have a head start in responding to the virus, which is a good thing but doesn’t affect herd immunity.”Since the novel coronavirus is a new pathogen, scientists did not expect people would have tools in their immune system capable of recognizing it. Unexposed people do not have cross-reactive antibodies, Crotty said.But in a study published this month in Science, Dr. Crotty and his colleagues offered a potential explanation for the surprising T cell results: they found these cross-reactive T cells also recognized four other coronavirus strains that cause common colds.Their theory: the T cells were created in response to other coronaviruses but can recognize SARS-CoV-2 like a distant relative.“It's a memory of a cousin,” Dr. Crotty said.That memory may speed up the body’s immune response, which can normally take about a week for an unknown pathogen, Crotty said. But scientists aren’t sure yet what role T cells actually play in clinical outcomes.“We have no data and and neither does anybody else as to whether these T cells really help or not,” Crotty said.To answer that question, scientists would need blood samples for lots of healthy people and then they would have to closely study individuals who got infected.The La Jolla Institute for Immunology is raising money for that kind of research, Crotty said, but they’re not there yet. 3417

SAN DIEGO (KGTV) -- In one San Diego neighborhood alone, around a half dozen residents have reported seeing rattlesnakes dangerously close to their front doors.The Department of Fish and Wildlife says avoid tall grasses and heavy brush if you can. And if your kids are playing in snake country — ditch sandals for a pair of boots.RELATED: Warm temps brings rattlesnake sightings across San Diego 408

SAN DIEGO (KGTV) -- Inclement weather beginning Monday and lasting through Thursday will bring cooler temperatures and rain to San Diego County amid a busy travel season. The first of a series of storms is set to arrive Monday, bringing rain and snow to the county. A second storm is due to bring another round of moisture Christmas night through Thursday. Between the two storm systems, light showers will occur, according to the National Weather Service. The first round of storms are forecast to dump as much as an inch of rain along the coast and in the mountains. RELATED: Check your San Diego County Forecast | Holiday traffic mapSnow levels will be between 5,500 and 6,000 feet through Monday, falling to near 5,000 feet early Tuesday. Snow accumulations between one and three inches are expected for elevations between 5,000 and 6,000 feet. Another storm arriving Christmas night and lasting through Thursday shows similar precipitation amounts, according to model data. The agency says the second storm is colder, which means it could have a greater impact in the mountains, including through the Cajon pass and I-8 across the San Diego County mountains. 1172

SAN DIEGO (KGTV) -- Less than a day after announcing that two students have contracted coronavirus, San Diego State University officials confirmed Thursday that two more students tested positive for the disease.Thursday's announcement raises the number of coronavirus cases on SDSU's campus to four since kicking off the fall semester this week.Officials said the two new cases are unrelated to the previous cases, and that the two students had only been to the campus to see testing at the Student Health Services. The two unidentified students are "recovering well and are away from campus," according to officials.RELATED: SDSU begins 2020-21 school year with mostly virtual classes"The two students did not interact with any SDSU employees or spaces, outside of the Student Health Services Outdoor COVID-19 Test Collection Booth, and were not in any other spaces utilized by the campus community," said Libby Skiles, Ed.D., SDSU Student Health Services Director.On Wednesday, the university confirmed two students had tested positive and that both students live off-campus. The students were also tested by the college's Student Health Services.Wednesday's cases are not believed to be connected to any reported off-campus gatherings, the school statement said.The school said the risk to others on campus is low and SHS is in the process of performing contact tracing.San Diego State: Two students test positive for COVID-19; Risk to campus 'low'Campus officials previously reported it has had 27 confirmed COVID-19 cases within the broader campus community among faculty, staff, students, and visitors to campus, including the SDSU Imperial Valley campus.SDSU started its 2020-21 school year this week with nearly all virtual classes, however, the campus isn't completely closed to students. There are about 2,600 students living on campus this semester, and hundreds more who have to visit the campus for certain matters. Normally, SDSU would have about 7,500 students living on campus.In a warning to the student body and staff, Skiles urged the SDSU community to continue using prevention techniques, "including wearing facial coverings and following U.S. Centers for Disease Control and Protection guidance to protect yourself and those around you.""Washing your hands for at least 20 seconds, and frequently, is one of the most important ways to help prevent the spread of COVID-19," said Skiles. 2417

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