which of the following is not a possible source of customer diversity? This is a topic that many people are looking for. thetruthaboutdow.org is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, thetruthaboutdow.org would like to introduce to you How do viruses jump from animals to humans? – Ben Longdon – YouTube. Following along are instructions in the video below:
“A maryland country fair in 2017. The prize pigs were not nlooking. Their best farmers farmers reported. Feverish hogs with ninflamed eyes and running snouts.
But while fair officials worried. The pigs. The maryland department of health was nconcerned about a group of sick fairgoers. Some had pet the pigs while others had nmerely been near their barns.
But soon. 40 of these attendees would nbe diagnosed with swine flu..
More often than not sick animals ndon u2019t infect humans. But when they do these ncross species infections or viral host jumps have the potential to produce ndeadly epidemics. So how can pathogens from one species ninfect. Another and what makes host jumps.
So dangerous viruses are a type of organic parasite ninfecting nearly all forms of life to survive and reproduce. They must move nthrough three stages contact with a susceptible host ninfection and replication and transmission to other individuals. As an example let u2019s look nat human influenza first the flu virus encounters na new host and makes its way into ntheir respiratory tract. This isn u2019t so difficult.
But to survive nin. This new body..
The virus must mount a successful ninfection before it u2019s caught and broken down nby. An immune response to accomplish this task viruses have evolved specific interactions nwith their host species human flu viruses are covered in proteins adapted to bind with matching receptors non human respiratory cells once inside a cell. The virus employs nadditional adaptations to hijack the host cell u2019s reproductive nmachinery and replicate its own genetic material. Now the virus only needs to suppress nor.
Evade. The host u2019s immune system long enough to replicate to sufficient nlevels and infect more cells at this point. The flu can be passed on to nits next victim via any transmission nof infected bodily fluid. However this simple sneeze also brings nthe virus in contact with pets plants or even your lunch viruses are constantly encountering nnew species and attempting to infect them more often than not this ends in failure in most cases.
The genetic dissimilarity nbetween. The two hosts is too great for a virus adapted to infect humans..
A lettuce cell would be a foreign and ninhospitable landscape. But there are a staggering number nof viruses circulating in the environment. All with the potential to nencounter new hosts and because viruses rapidly reproduce nby the millions they can quickly develop random mutations. Most mutations will have no effect nor even prove detrimental but a small proportion may enable the npathogen to better infect a new species the odds of winning this destructive ngenetic lottery increase over time or if the new species is closely related nto the virus u2019 usual host for a virus adapted to another mammal infecting a human might just take na few lucky mutations and a virus adapted to chimpanzees one of our closest genetic relatives nmight barely require any changes at all it takes more than time and genetic nsimilarity for a host jump to be successful some viruses come equipped to easily ninfect a new host u2019s cells.
But are then unable to evade nan immune response others might have a difficult time ntransmitting to new hosts for example they might make the host u2019s nblood contagious. But not their saliva. However once a host jump reaches nthe transmission stage. The virus becomes much more dangerous now gestating within two hosts.
The pathogen has twice the odds of nmutating into a more successful virus and each new host increases nthe potential for a full blown epidemic virologists are constantly looking for nmutations that might make viruses such as influenza nmore likely to jump. However predicting the next potential nepidemic is a major challenge..
There u2019s a huge diversity of viruses nthat. We u2019re only just beginning to uncover. Researchers are tirelessly studying the nbiology of these pathogens and by monitoring populations to quickly nidentify new outbreaks. They can develop vaccines and containment nprotocols to stop these deadly diseases.
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Discover the science of how viruses can jump from one species to another and the deadly epidemics that can result from these pathogens.
At a Maryland country fair in 2017, farmers reported feverish hogs with inflamed eyes and running snouts. While farmers worried about the pigs, the department of health was concerned about a group of sick fairgoers. Soon, 40 of these attendees would be diagnosed with swine flu. How can pathogens from one species infect another, and what makes this jump so dangerous? Ben Longdon explains.
Lesson by Ben Longdon, directed by Cabong Studios.
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