TedEd-07

How Do Viruses Jump fromAnimals to Humans

At a Maryland country fair in 2017, the prize pigs were not looking their best. Farmers reported
feverish hogs with inflamed eyes and running snouts. But while fair officials worried about the pigs,
the Maryland department of health was concerned about a group of sick fairgoers. Some had pet
the pigs, while others had merely been near their barns; but soon, 40 of these attendees would be
diagnosed with swine flu. More often than not, sick animals don’t infect humans. But when they do,these cross-species infections, or viral host jumps, have the potential to produce deadly epidemics.
So how can pathogens from one species infect another, and what makes host jumps so dangerous?
Viruses are a type of organic parasite infecting nearly all forms of life. To survive and reproduce,
they must move through three stages: contact with a susceptible host, infection and replication, andtransmission to other individuals. As an example, let’s look at human influenza. First, the flu virus
encounters a new host and makes its way into their respiratory tract. This isn’t so difficult, but toTedEd-07

How Do Viruses Jump fromAnimals to Humans

survive in this new body, the virus must mount a successful infection before it's caught and broken
down by an immune response. To accomplish this task, viruses have evolved specific interactions
with their host species. Human flu viruses are covered in proteins adapted to bind with matching
receptors on human respiratory cells. Once inside a cell, the virus employs additional adaptations tohijack the host cell’s reproductive machinery and replicate its own genetic material. Now the virus
only needs to suppress or evade the host’s immune system long enough to replicate to sufficientlevels and infect more cells. At this point, the flu can be passed on to its next victim via anytransmission of infected bodily fluid.
However, this simple sneeze also brings the virus in contact with pets, plants, or even your lunch.
Viruses are constantly encountering new species and attempting to infect them. More often thannot, this ends in failure. In most cases, the genetic dissimilarity between the two hosts is too great.
For a virus adapted to infect humans, a lettuce cell would be a foreign and inhospitable landscape.
But there are a staggering number of viruses circulating in the environment, all with the potential toencounter new hosts. And because viruses rapidly reproduce by the millions, they can quickly
develop random mutations. Most mutations will have no effect, or even prove detrimental; but asmall proportion may enable the pathogen to better infect a new species. The odds of winning thisdestructive genetic lottery increase over time, or if the new species is closely related to the virus’
usual host. For a virus adapted to another mammal, infecting a human might just take a few lucky
mutations. And a virus adapted to chimpanzees, one of our closest genetic relatives, might barely
require any changes at all. It takes more than time and genetic similarity for a host jump to be
successful. Some viruses come equipped to easily infect a new host’s cells, but are then unable toevade an immune response. Others might have a difficult time transmitting to new hosts. Forexample, they might make the host’s blood contagious, but not their saliva. However, once a hostjump reaches the transmission stage, the virus becomes much more dangerous. Now gestatingTedEd-07

How Do Viruses Jump fromAnimals to Humans

within two hosts, the pathogen has twice the odds of mutating into a more successful virus. Andeach new host increases the potential for a full-blown epidemic.
Virologists are constantly looking for mutations that might make viruses such as influenza more
likely to jump. However, predicting the next potential epidemic is a major challenge. There’s a hugediversity of viruses that we’re only just beginning to uncover. Researchers are tirelessly studying thebiology of these pathogens. And by monitoring populations to quickly identify new outbreaks, they
can develop vaccines and containment protocols to stop these deadly diseases.