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To end the pandemic, there need to be enough people immune to COVID-19 and there are two ways to do that: immunity through infection or from a vaccine."I think racing to herd immunity is the dangerous thing that I’m concerned about," said Dr. Stuart Ray, a professor of medicine at Johns Hopkins University School of Medicine.Herd immunity is when the spread of the infection cannot be sustained because the number of people who are immune is high enough. Some countries are considering it as a strategy to combat COVID-19.But Ray said it could not work in the US unless much more effective treatments are developed.He says on average, a newly infected person infects two others, so to have herd immunity from COVID-19 about 60 percent of people would have to become immune."We would have something like another 100 million people, maybe more, infected. 150 million more and even if the major complication rate is a fraction of 1 percent, we will still have huge numbers of deaths," said Ray.He said we also don’t know if just having had the infection once will create lasting immunity to control the spread."It possible that you could be immune enough not to get sick and still not immune enough to prevent that spread and so herd immunity is a tough bar for us to aim for because not only do we need 60 percent of people to be immune but we need them to be immune in a way that prevents them from infecting other people," said Ray.The other way to achieve herd immunity would be through a vaccine."Vaccines can work better, provide better immunity than the natural infection does. The new shingles vaccine provides great immunity and protects more than 95 percent of people from getting shingles," said Ray.Several vaccines are still going through the last phase of clinical trials to see if any also creates enough immunity to prevent passing the virus along.This story was first reported by Abby Isaacs at WMAR in Baltimore, Maryland. 1946

TORONTO — Canada is introducing a contact tracing smartphone app that will notify Canadians of exposure to the new coronavirus.Prime Minister Justin Trudeau says the app will be voluntary and that if someone tests positive, other users who have the app and have been in proximity will then be alerted they’ve been exposed to someone who has tested positive.Trudeau says that the government will not collect any data from the app and users won't need to enable location services in order to use it.Governments around the world have been turning to smartphone technology to help battle fresh virus flare-ups as they ease lockdown restrictions. But technical problems and privacy concerns have dogged the development of virus tracing apps. 744

There is a heavy police presence at Mercy Hospital in Chicago after there were reports of shots fired inside the building Monday afternoon.WLS-TV in Chicago is reporting there are multiple injuries, and the building is being partially evacuated. Chicago Police said one officer was shot and wounded, and he is in critical condition. The TV station has interviewed witnesses who said they saw at least one person get shot and heard as many as 20 gunshots fired.Some witnesses ducked and hid as they hear the gunshots ring out, WLS-TV reports.Police also said the suspect was shot. 602

TIJUANA, Mexico (KGTV) - The first group of people from the migrant caravan have arrived in Tijuana, according to a Mexican journalist. According to journalist Jorge Nieto, the group has 85 people. This group is reportedly people of the LGBTQ+ community and they left the others behind because they felt they were being discriminated against. They arrived at the Tijuana bus station, then took buses to an Airbnb in Playas de Tijuana, paid for by U.S. lawyers with the caravan.RELATED: Bulk of migrant caravan is 1,600 miles away from TijuanaOnce at the house, neighbors clashed with the migrants, "Yelling at them go away go to a shelter, this is not your place, all you came here this is a safe area and we are afraid of you," Nieto said shelters aren't an option as they are already over capacity from the last caravan.Nieto said the migrants defended themselves, saying the neighbors could hurt them as well, "we're not going to make noise, we're not going to make any mess."One migrant spoke with reporters saying they had the right to seek refuge in another country and pursue a better life with respect.It's not clear when they plan to turn themselves into U.S. Customs and Border Protection (CBP) and seek asylum in the United States.The group will reportedly spend a few days in Tijuana to rest. RELATED: Interactive Map: Migrant caravan journeys to U.S.-Mexico border / Timeline: Migrant caravan travels to border / Photos: Migrant caravan makes its way to border 1531

TIJUANA (KGTV) -- Mexico's president, Andres Manuel Lopez Obrador, spoke at a unity rally on Saturday evening, just hours after coming to an agreement with the U.S. avoiding tariffs on Mexican goods. The deal was announced Friday night. In his speech, Lopez Obrador said Mexico is open to collaboration. In his speech to a crowd of thousands, the president said the tariffs would have impacted both economies. The agreement means Mexico will send 6,000 troops to its southern border with Guatemala to help control migration and vowing to crack down on human trafficking and smuggling networks. Obrador's visit to Tijuana created tensions among Mexicans who have conflicting opinions about the deal. The tariffs would have started on Monday.President Trump hasn't publicly responded to Saturday's speech in Tijuana but in Friday's tweet, he thanked the Mexican government for working to come to this agreement. 918