Bats' immune systems have unusual features that cause viruses to fight back
-2 leapt from to infect human beings remains unknown. But the evidence suggests that bats were involved at some point—perhaps not as the immediate source of the virus, but probably as the reservoir from which it ultimately came.outbreak, in 2002. Though this was transmitted to people by palm civets, they probably caught it from horseshoe bats ., another coronavirus, is similarly suspected of starting in bats, though the immediate source of human infection is camels.
The idea that this may not be a coincidence has led people to ask if there is something special about bats which encourages the evolution within them of viruses predisposed to jump the species barrier and infect other sorts of animals. At the moment, the evidence is mixed. In favour of the idea is an experiment conducted recently by Cara Brook of the University of California, Berkeley, and published in February in e. This suggests a possible mechanism. Some bats have unusual immune systems, in which an antiviral process known as the interferon pathway is always active, rather than being switched on in response to infection. Dr Brook and her colleagues conducted experiments on cells from bats that have this arrangement and on others which do not .
by Nardus Mollentze and Daniel Streicker of the University of Glasgow. Dr Mollentze and Dr Streicker found that the number of viruses which have passed to people from 11 orders of mammals and birds is pretty much proportional to the number of species in each order. Bats are the second-most diverse mammalian order, after rodents. “It is therefore not surprising”, Dr Mollentze observes, “that as a group they are associated with a large number of viruses.
This study is in line with work done specifically on coronaviruses by Tracey Goldstein of University of California, Davis. In 2017 she and her colleagues published a piece of research in which they had tested for coronaviruses in bats, rodents and primates in 20 countries in Africa, South America and Asia. Individual bat species normally had between one and five types of coronavirus.
日本 最新ニュース, 日本 見出し
Similar News:他のニュース ソースから収集した、これに似たニュース記事を読むこともできます。
Facebook to warn users who 'liked' coronavirus hoaxesFacebook, Google and Twitter are introducing stricter rules, altered algorithms and thousands of fact checks to stop the spread of bad misinformation online about the virus.
続きを読む »
Trump Sides With Coronavirus in Endorsement of COVID-19 Truther ProtestsTrump encourages people to “liberate” three states with Democratic governors, taking a bold stance against democracy and for the spread of a deadly virus
続きを読む »
Nations debate easing lockdown as economic hardship growsMandatory lockdowns to stop the spread of the new virus, which has so far infected more than 2.2 million people and for which there is no vaccine, have brought widespread hardship.
続きを読む »
Scant testing in US migration system risks spreading virusGUATEMALA CITY (AP) — The Trump administration’s failure to test all but a small percentage of detained immigrants for the novel coronavirus may be helping it spread through the United States’...
続きを読む »
Dividend cuts are the new shareholder-value tradeSchlumberger’s stock surged after the company slashed its payout by 75%. Granted, it’s because investors are now more comfortable with the $19 bln oil-services firm’s balance sheet. But as virus pain spreads across industries, ditching dividends’ sacrosanct status is a must.
続きを読む »