Obviously this is not a full list, but as we continue to cut down forests and poach animals for food (animals who would otherwise have remained untouched by humans), we raise our chances for massive outbreaks. 

Perhaps more worrying is that livestock outnumber both wildlife by mass and humans in number, plus most livestock are raised in factory farms or feedlots, which raises their chances of contracting diseases, and stresses them so that their immune systems are less robust. 

Making these numbers even more concerning is the fact that according to one study 73% of the world's antibiotics are going to these animals as a "therapeutic" doses to encourage faster growth, and that this practice has led to a dramatic increase in antibiotic resistance. 

One particularly worrying study found that:

"In reviewing data from the Netherlands, a team of Hopkins and Dutch scientists found that the odds of being exposed to methicillin-resistant Staphylococcus aureus, or MRSA, are greatest in the southeast region of that European country, an area with many livestock farms. The risks were not limited to the farmers themselves, but were also elevated for people living near herds of cattle, pigs or veal calves, the researchers said.

MRSA most commonly causes skin infections, but it can also produce pneumonia or more severe and potentially life-threatening infections in the bloodstream and at surgical sites. While in the past believed to be mainly a problem in hospitals and other health care facilities, more cases are turning up in non-health settings. More than 40 percent of the MRSA cases in the Netherlands have been associated with livestock, according to the study.

After factoring out farmers and other people in direct contact with farm animals, researchers found the odds of someone being exposed to the strain of MRSA associated with livestock were nearly 25 percent greater if they lived near pigs and 77 percent higher if near cattle.

While the study looked at MRSA exposures in relation to herds of pigs, cows and veal calves, Feingold said it may also be worth looking to see if similar patterns turn up in areas with intensive poultry production, such as the Delmarva Peninsula. Dutch researchers have found chickens to be a reservoir for MRSA as well, she said, though not as frequently as with livestock."

This means that as antibiotics become less effective, there will be even greater danger as emerging diseases are more likely to start out with antimicrobial resistant traits making them even harder to stop or slow down in future outbreaks.

Resources

Reducing Antibiotic & Antimicrobial Use in the Food Industry

• Reducing Antimicrobial Use in Food Animals (Article, 29/Sep/2017)

General Food Industry Information

• US Factory Farming Estimates (Article, 22/April/2019)

Societal Costs of Antibiotics in Food Production

• The NHS is Paying for the Hidden Health Costs of Cheap Meat (Article, 2022) "A massive 75% of the world’s antibiotics are given to these farmed animals.
  
  The NHS is under record pressure, and now they are facing the burden of dealing with patients that have developed antibiotic resistance.
  
  Worryingly, the levels of humans developing antibiotic resistance are rising and this is predicted to be the leading cause of death by 2050, with an estimated economic cost of £66 trillion.
  
  Furthermore, with the intensive farming practices that these animals are subjected to, the risk of creating zoonotic pathogens is higher, which could result in more viruses that are contagious to humans."

Outbreaks & Their Origins

Chronic Wasting Disease - > Human Version of Mad Cow Disease

Chronic wasting disease appears to transmit to humans when their meat is consumed. Deer hunters who often ate infected dear suffered rapid-onset of Sporadic CJD  (the human version of mad cow disease). These people became confused, violent, and died shortly after, despite aggressive treatment. -  Study: Hunters Die After Consuming CWD-Infected Venison 

Mask Up!

• DIY Mask Instructions These do NOT contain filters and have about 1/3rd the effectiveness of surgical or N95 masks, but may still help reduce virus transmission among civilians and workers while at the same time not adding to the shortages of medical masks currently affecting hospitals around the world. Another style of DIY Mask + Donate/Request/Drop off Masks. Also, the CDC's page for "Use of Cloth Face Coverings to Help Slow the Spread of COVID-19" which includes NO-SEW instructions!