I'm only a nurse, not an epidemiologist but can speak with some knowledge of the transmission of communicable diseases. There's a good documentary available on YouTube regarding Mary Mallon, commonly referred to as 'Typhoid Mary' and even 'Bloody Mary'. Here's a link to the PBS documentary if anyone is interesed.
https://www.youtube.com/watch?v=slzdZSr-B-E
From Wiki:[snip]Mary Mallon (September 23, 1869 – November 11, 1938), also known as Typhoid Mary, was an Irish-American cook. She was the first person in the United States identified as an asymptomatic carrier of the pathogen associated with typhoid fever. She was presumed to have infected 51 people, three of whom died, over the course of her career as a cook. She was twice forcibly isolated by public health authorities and died after a total of nearly three decades in isolation.[/snip]
In addition to Typhoid fever, other diseases will become epidemic like Tuberculosis, Hepatitis A, Cholera, Dysentery and a host of others.
Contrary to what another poster said, the homeless crisis is not due to "unlawful alien population". That's a total lie and will be put out there by Trump supporters because it serves their narrative on illegal immigration. Most people will be surprised to know the statistics on homeless. New York has the greatest numbers of homeless and Los Angeles is second. Hawaii claims the highest per capita homelessness among states.
So what lies at the root cause of the increasing numbers of homeless? (Keep in mind that there are increasing numbers of homeless in just about every big city in the U.S.) There is an important distinction to make. L.A. stands out for its high number of homeless people who are "unsheltered"—meaning living in cars, tents, and out in the open. About 75 percent of L.A.'s homeless are unsheltered. New York City has a bigger overall number of people who lack permanent homes, some 77,000. But far fewer are on the street — about 5 percent of the homeless population is unsheltered there.
Another thing that makes L.A.'s homeless population distinct is the relatively low prevalence of substance use disorders and serious mental illness. Though mental illness is a huge issue, less than a third (27 percent) of people who are homeless on any given night have a serious mental illness and 15 percent have a substance use disorder. The reasons that the homeless population is so large right now and growing larger each day is because cities like San Francisco and L.A. are less affordable than ever before in California's history. Believe it or not, many of the people out on the street or living in camper trailers are actually living very close to their previous residence. In L.A. and S.F., most people are renting the homes they're living in, they don't own them. Rents have soared as much as 50% in L.A. and San Francisco.
The Silicon Valley region of San Francisco is a global center for high technology, innovation and social media. Silicon Valley is home to many of the world's largest high-tech corporations, including the headquarters of 39 businesses in the Fortune 1000, and thousands of startup companies. The cost of rents in the S.F. area exploded putting a lot of people that couldn't afford the increases in their rents, out on the street. It's a huge, complicated and increasingly grave situation. People living on the streets have no places to refrigerate or store medicines, no place to receive mailed appointment reminders or a visit from a visiting nurse, no place to dress a wound or plug in medical equipment like oxygen. Without access to hygiene facilities, they are at high risk for communicable diseases like hepatitis A and a host of others.
