OK, heres the first part. Incidentally, I didn't write this, a friend of mine did. I turned it into a podcast.
Food and Health
The Coronavirus has shone a spotlight on the many inadequacies of our food and agricultural system. During the crisis people have focused on the immediate problems of getting food, but we need to understand how these viruses emerge as a result of deadly human-animal interactions and how we use land. Coronaviruses are not the only danger to health. The way food is produced and consumed has a number of other health risks, including the rise of antimicrobial resistant bacteria from the use of antibiotics in livestock farming and the fact that much food we eat is not actually good for us. All these issues arise because agriculture is part of capitalism, which means that the purpose of production is to make profits, not to satisfy the needs of humans for food that helps them to live healthy lives.
Food production: Animals, land use and factory farming
The increase in zoonotic diseases
Many of our health and ecological problems have their roots in how humans relate to other animals and life, through industrial farming and fishing, the domestication of animals, and 21st century cities. Diseases passed from animals to humans are called zoonoses. An estimated 75% of new and emerging diseases originate in nonhuman animals. There are more than three dozen we can catch directly through touch and more than four dozen that result from bites. The cross-species infection can originate on farms or markets, where conditions foster mixing of pathogens, giving them opportunities to swap genes and gear up to infect (and sometimes kill) previously foreign hosts. Or the transfer can occur from such seemingly benign activities as letting a performance monkey on some Indonesian street corner climb on your head
10 Deadly Diseases That Hopped Across Species.
Influenza or flu is caused by these viruses. When humans first domesticated wild animals they would have come into contact with diseases that would have at first killed them but now most of these we have learned to live with either by developing immunities or vaccines. However, increasingly we are coming into contact with new viruses. Pandemics are epidemics that affect a large proportion of the world due to a novel virus. Pandemics are unpredictable, but recurring events that can have health, economic and social consequences worldwide. An influenza pandemic occurs when a novel influenza virus emerges with the ability to cause sustained human-to-human transmission, and the human population has little to no immunity against the virus. With the growth of global travel, a pandemic can spread rapidly globally with little time to prepare a public health response.
Influenza's wild origins in the animals around us
Avian Flu
Avian or bird flu has been a common type. It originates in wild birds and somehow can then infect domestic poultry. Humans who come in close contact with birds with the virus are susceptible. However, normally these strains do not pass from human to human and can be controlled, though it can be disastrous for the animals who get it. However, increasingly there has been mutations so that some viruses emerge that can be transmitted between humans. This is called an anti-genetic shift. The so-called Spanish flu, which did not originate in Spain but most like in the US on a poultry farm, was one such virus, though at the time it was not recognised as such. It spread rapidly after WWI and was very deadly - killing millions. It is still not clear how many were killed but it could be upwards from 50 million.
Since then there have been others forms of avian flu outbreaks, spreading from poultry farms. In the 1990s the world’s poultry population grew 76% in developing countries and 23% in developed countries. Outbreaks have become more frequent because of the intensity of production, with the animals all packed together, and the increase in live transport. The consequences for poultry and the livelihood of those who raise them has been disastrous with millions of birds killed. However, human infections were relatively low, if we don’t count the 1918 pandemic.
The numbers of human deaths tend to be relatively low and are mostly among those who work with poultry. In a 2006 outbreak just over 100 died. One strain, which emerged in 2008, killed more- about 243 but the British government was predicting a pandemic with 75,000 dead
Britain faces 75,000 deaths in bird flu pandemic, Lords report predicts.
Even now, with coronavirus the main concern, there is an outbreak of avian flu in poultry in China.
Though there are relatively few human deaths and disaster has been averted on numerous occasions, there is always a concern that there could be a mutation in the virus which would end in a deadly pandemic.
“We don’t know how the story’s going to end,” warned Nancy Cox, who retired from the Center for Disease Control and Prevention in late 2014 after leading its influenza operations for more than two decades
What happened to bird flu? How a threat to human health faded from view.
Swine flu is another deadly virus, though now the annual flu jab contains a vaccine against it. But in 2009-2010 it was declared a pandemic. It originated in pigs in a small area of Mexico and spread globally. An estimated 151,700 to 575,400 people died globally in the first year.
1918 Spanish Flu Pandemic Was Likely Bird Flu