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SAN DIEGO (KGTV) - Two weeks after their son was killed, the parents of Alexander Mazin spoke to 10News for the first time about the brutal attack.Penelope and Jeffrey Mazin say their son left for the 24 Hour Fitness gym on Midway Dr. around 9 a.m. on Feb. 25, 2018.“I said 'I love you' and I kissed him on his little fuzzy beard,” remembered his mom, “and he walked out the door. I’m glad I saw him that morning.”He was scheduled to meet with his dad at noon, but by 12:05, his parents were already worried. He was never late.They started calling hospitals and police stations. Little did they know, officers were already searching for him.“Two plainclothes detectives in black cars pulled up and my heart sunk because I knew right then and there something horrible must have happened,” said Jeffrey.The suspect in the case has been identified as Ernesto Castellanos.The Mazins say Castellanos was in a previous relationship with their son’s girlfriend. They say Alexander had been dating the woman for about three months but kept their relationship somewhat private.There were warning signs. Two weeks before the killing, they say Castellanos had attacked the woman while she was working out with Mazin at a 24 Hour Fitness.Castellanos’ whereabouts are unknown. The Mazins say, police believe he may have fled to Mexico. A ,000 reward is being offered for information leading to his arrest. Anonymous tips can be made to San Diego Crime Stoppers. 1478

SAN DIEGO (KGTV) -- Two UC San Diego Health workers have tested positive for COVID-19, officials with the medical system announced Saturday.UCSD Health said in a statement that the workers "are recuperating at home and doing well," officials said."Both infected health workers sought medical assessment after exhibiting key respiratory symptoms, and were tested," according to UCSD Health.University officials cite "exposure and infection in the community" as reasons for the workers contracting the virus, rather than from travel or a patient."UC San Diego Health has launched an extensive effort to identify any patients or health system colleagues who may have been in recent contact with either of the two health workers," officials said.The group operates three hospitals: UC San Diego Medical Center in Hillcrest, Jacobs Medical Center in La Jolla, and Sulpizio Cardiovascular Center also in La Jolla. A public information official with UCSD Health said they are not disclosing which locations or duties the infected workers are assigned at this time.Stay with 10News for updates to this developing story. 1121

SAN DIEGO (KGTV) -- We know many of you have questions about how to navigate the upcoming school year with your children at home. On Monday Aug. 3 at 9:30 a.m., ABC 10News San Diego anchor Lindsey Pena will talk with Dr. Abisola Olulade about how to keep children healthy in a remote learning environment -- covering physical activities, healthy break structures, and more. 381

SAN DIEGO (KGTV) -- With the unknown future of in-person education, the Cajon Valley Union School District has continued to welcome kids to campus since March, but not as students. They’re offering child care.“They’re getting topics that they typically wouldn’t always get during the school year. Fun, light topics more like a summer camp but still learning,” said Assistant Superintendent of Educational Services Karen Minshew.She said their priority is giving a safe place to stay for children as their parents go to work.Gov. Gavin Newsom and California health officials have laid out a plan stating counties have to be off the state’s monitoring list for 14 days before they can reopen schools. Minshew said even with this announcement, their current setup falls within the guidelines.“Nothing had changed in terms of the model for child care so yes there’s was information for schools and what’s possible for schools but not child care,” she said.Danica Mitchell has a son who will be starting first grade in the fall. She dropped him off at Chase Avenue Elementary School for the summer program and said she’s happy with the steps the school has taken to keep the students safe.“I’m emotional because I’m an essential worker so both my husband and I work and we need to work to support our family so it’s very important that my child have somewhere to go,” said Mitchell.Minshew said they are considering four different models for the fall term but no matter what happens regarding education and policies for having students on campus, they will be there to offer childcare no matter what. The four options the district is working with are home schooling, distance learning, a hybrid model (2 days at school, 3 days at home), or 100% At School. 1758

SAN DIEGO (KGTV) -- We’ve known for a while that COVID-19 hits people over 65 especially hard, but a study published Wednesday from researchers in San Diego offers new insight into why that happens.The numbers are staggering: if you’re 65 or older, your risk of winding up in the hospital from COVID-19 is five to 11 times higher than someone under 30. Your risk of death is at least 90 times higher, according to data from the Centers for Disease Control and Prevention.Researchers at the La Jolla Institute for Immunology say the reason why older people fare so much worse appears to be from a lack of T-cells, a type of white blood cell that can decline with age.“Some viruses get controlled by one part of the immune system. Some viruses get controlled by another. In this case it seems that T-cells really do a lot of the work,” said Dr. Shane Crotty, one of the authors of the study published Wednesday in the journal Cell.Dr. Crotty and his colleagues looked at 50 people infected with the virus, and they measured the three elements of the adaptive immune system in detail: antibodies, helper T-cells and killer T-cells.Then they compared the measurements to how people fared against the virus. Some patients in the study group had severe cases, others had mild infections.The researchers found that people with all three branches of the adaptive immune system tended to fully recover. People with severe cases of the virus often lacked one or more of the immune branches, and it was particularly evident in older people.“Our data indicated that of the older individuals, it was particularly the ones that had fewer T-cells to start that look like they really struggled to control this virus,” Dr. Crotty said.As we age, we have fewer T-cells to send after invading pathogens. “That collection of T-cells gets smaller. So it’s harder to recognize a new virus,” Crotty said.Among the 748 deaths in San Diego County reported as of Wednesday, 87% were people aged 60 and older.The findings from LJI may have implications in the search for a vaccine against COVID-19. The data suggests that vaccine-makers may want to target a drug that elicits all three branches of the immune response, Dr. Crotty said. Some vaccine approaches, such as inactivated virus vaccines, only elicit two of three branches, not killer T-cells. However, Crotty said it was too soon to rule any candidates. Two strong branches produced by a vaccine could potentially cover for the lack of a third, he said.Crotty said the findings could help vaccine-makers interpret results from the clinical trials and find the right dosing.“Is a given vaccine a good vaccine, and you just need a booster immunization?” he said. “Does it work well in one population but it doesn’t help in the elderly because it doesn’t generate a T-cell response, for example? Those are the scenarios when this type of knowledge will come into play.” 2906