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During the last few months, many health experts have been talking about reaching “herd immunity” with the distribution of the COVID-19 vaccine. Over the Christmas weekend, Dr. Anthony Fauci said he estimates the country needs to reach 80-85% with the vaccine to attain herd immunity.Here’s what that means.Herd immunity is a concept used in discussions about vaccination, and signifies the threshold needed for a population as a whole to be protected from a virus.The World Health Organization clarifies that herd immunity, or population immunity, “is achieved by protecting people from a virus, not by exposing them to it.”The Mayo Clinic also describes the situation following the 1918 Spanish Flu outbreak. They say people who survived the pandemic were later immune to infection of the H1N1 flu, also referred to as swine flu.Health experts warn that relying on community infection to create herd immunity could be dangerous; there are questions about how long the antibodies created by infection protect against reinfection, and a high level of community infection could lead to overwhelmed medical facilities and a high number of deaths.When the threshold of herd immunity is reached, it means the vast majority of a population is vaccinated and has antibodies, thereby lowering the overall amount of community spread of the virus. It also means portions of the population who cannot get vaccinated are kept safer by the limited spread.What that threshold is varies depending on the virus and the efficacy of the vaccine.According to the WHO, herd immunity against the measles is reached with 95% vaccination, while herd immunity against polio is 80%.Dr. Fauci believes herd immunity for COVID-19 can be reached with around 85% of the population having antibodies. 1778

EL CAJON, Calif. (KGTV) — San Diego Sheriff's bomb/arson detectives were called to investigate a house fire that broke out Wednesday afternoon.Firefighters and deputies were called to the 1600 block of Via Elisa just before 3 p.m. Wednesday after the fire broke out at the home.Strong winds threatened nearby structures, forcing deputies to evacuate the homes, the SDSO said.Based on the initial investigation, Sheriff's bomb/arson detectives were called to the scene.The cause of the fire has not been determined, but the investigation was ongoing late Wednesday. 572

EL CAJON, Calif. — The end of a partnership between a police K9 and his handler created an emotional moment in California.One of the El Cajon Police Department’s K9s, K9 Jester, is being assigned a new partner after his current partner resigned from the department.After working with Jester for the last two and a half years, Officer Jordan Walker voluntarily resigned to work for another agency, according to the department. Walker said he offered to pay for Jester, who was brought in through a Ben Roethlisberger?Foundation grant. K9s cost anywhere from ,000 to ,000 to bring in and train, according to the foundation.Because Jester is still in excellent health, he was assigned to work with a new partner, Officer Randall Gray. Gray and Jester have already started the bonding process and training together, the department said Thursday. Once the pair completes the academy, Jester will again resume his service.El Cajon police Thursday tweeted out a photo of Gray and Jester together.  1043

DUBAI, United Arab Emirates (AP) — Saudi Arabia’s state television says final verdicts have been issued in the case of slain Washington Post columnist and Saudi critic Jamal Khashoggi after his family announced pardons that spared five from execution.The Riyadh Criminal Court issued final verdicts Monday against eight people.The court ordered a maximum sentence of 20 years in prison for five, with one receiving a 10-year sentence and two others being ordered to serve seven years in prison.The trial was widely criticized by rights groups and an independent U.N. investigator, who noted that no senior officials nor anyone suspected of ordering the killing was found guilty.The independence of the court was also brought into question. 747

Dr. Anthony Fauci said during an interview on Wednesday that a World Health Organization expert was “not correct” for stating that coronavirus infections from those who are asymptomatic are “very rare.”Dr. Maria Van Kerkhove, a World Health Organization’s infectious disease expert, walked back her comments from Monday one day later, qualifying her statement by saying it’s not the official policy of the WHO."I used the phrase 'very rare.' I think that's misunderstanding to state that asymptomatic transmission globally is very rare. What I was referring to was a subset of studies," Van Kerkhove said during a press conference on Tuesday. "I was just trying to answer a question at a press conference, I wasn't stating a policy of the WHO or anything like that."While the majority of coronavirus cases come from those who are symptomatic, Fauci said on ABC’s “Good Morning America” that the spread from those who are asymptomatic is not uncommon."The evidence that we have given the percentage of people, which is about 25, 45-percent of the totality of infected people, likely without symptoms," he said. "And we know from epidemiological studies that they can transmit to someone who is uninfected, even when they're without symptoms. So to make a statement to say that's a rare event was not correct."On Monday, Dr. Ashish Jha, the director of Harvard's Global Health Institute, took issue with Van Kerkhove's anaylsis"Asymptomatic spread is the Achilles heel of this outbreak," Jha tweeted. "Both asymptomatic and pre-symptomatic spread huge problem for controlling disease because folks shedding virus while asymptomatic pre-symptomatic has one advantage: You can use contact tracing to find folks they infected. But that doesn't help prevent pre-symptomatic spread"Jha cited a May Swiss study that indicated that between 40 and 60% of all coronavirus cases originated from people when they didn't have symptoms at the time of the spread.The debate comes as a number of states are continuing to see an increase in coronavirus cases. Most notably is Arizona, which has advised hospitals to be prepared to expand intensive care units in order to accommodate the influx of coronavirus patients. 2208