Covid-19 – conspiracies, remdesivir

Canto: So, getting back to Covid-19, I want to look at two unrelated issues – the limited approval of remdesivir as a treatment, and the claim by the US government that the virus escaped from a lab in Wuhan. What do you think?
Jacinta: Well let me briefly address the second matter – I haven’t yet looked into the claim, but I will say that, IMHO, the current US federal government is possibly the largest misinformation machine on the globe at present, and I won’t be happy till I see every member of that non-administration in jail.
Canto: Okay, be prepared for a life of misery. I agree though, that Pompeo is a slimeball, and it’s very likely that this is largely designed as another blame-shifting distraction by the US maladministration. I don’t remember hearing about this from any news source before Pompeo announced it.
Jacinta: Well it’s interesting that, in investigating this, we have to contend with, and generally ignore, two of the most untrustworthy governmental sources of information on Earth, the USA and China. So thank dog for independent journalists, scientists and investigators. We need them so much at this time. The Washington Post has a 2000-word article on the issue, posted on May 1, undoubtedly in response to moves by Frumpy & co to get the US public to blame China for the pandemic. The article describes an assessment from the US intelligence community:
While asserting that the pathogen was not man-made or genetically altered, the statement pointedly declined to rule out the possibility that the virus had escaped from the complex of laboratories in Wuhan that has been at the forefront of global research into bat-borne viruses linked to multiple epidemics over the past decade.
Canto: ‘Pointedly declining to rule out’ means very little. They’re making a point of saying it’s possible? Isn’t it more likely to have come from the ‘wet markets’ – wet with blood that is – as a result of that traditional Chinese fondness for dining and medicating on exotica?
Jacinta: ‘Murky’ is how the WaPo describes the origins. Some scientists are saying it’s highly likely to have been ‘naturally transmitted’, others, not so sure. But the thing is, the scientists are the ones to trust on this, certainly not the Chinese or US governments. And even then you need to check those scientists’ allegiances.
Canto: I should also point out, as so many scientists are doing, that now is not the time for playing the blame game. Knowledge is power, and we need to be pooling our global resources, and our knowledge, to combat this and future pandemics. We need to try and build trust, not to sow distrust. And this isn’t to say that accidents can’t and don’t happen in virology and microbiology labs around the world, including in the USA.
Jacinta: The WaPo also has much to say about renowned virologist Shi Zhengli, team leader at the Wuhan Institute of Virology, which is being targeted by the Trump administration’s propaganda campaign. According to Shi, ‘the institute never possessed the SARS-CoV-2 virus’, while Wuhan’s health commission has found, or claimed, that the first person who died of the virus purchased goods at the Huanan Seafood Wholesale Market.
Canto: So it may have come from seafood?
Jacinta: Don’t know. Probably they sold more than seafood there, or it was part of a wider market. Anyway, many virologists, including US scientists who’ve worked with her, vouch for Shi’s extreme rigour and brilliance. But clearly that won’t stop the US government’s attempt at character assassination. I’ve heard they’re trying to say, or infer, that the virus was engineered at the Wuhan lab – and no doubt millions of Yanks will believe this brilliant theory, that the virus was engineered by mad scientists and then let loose to kill thousands of their own people before being unleashed upon the world – to be followed up by Chinese chem-trails, no doubt.
Canto: And not just Yanks. Anyway let’s move on to a happier topic. Remdesivir.
Jacinta: Well the news is that the FDA in the USA has issued an Emergency Use Authorisation for remdesivir, and the Gilead company which owns this pharmaceutical, has issued a company statement (on May 5), and here’s a quote:
Gilead’s overarching goal is to make remdesivir both accessible and affordable to governments and patients around the world, where authorized by regulatory authorities…. Gilead is in discussions with some of the world’s leading chemical and pharmaceutical manufacturing companies about their ability, under voluntary licenses, to produce remdesivir for Europe, Asia and the developing world through at least 2022.
I’ve listened to an interview with Gilead’s CEO Daniel O’Day, and he was making all the right caring-and-sharing noises…
Canto: Can we revisit what remdesivir is and does?
Jacinta: Of course. For starters it’s not a cure, it’s essentially ‘an investigational antiviral drug’ (I’m quoting again from the company statement) which, O’Day is careful to point out, ‘has not been approved by the FDA for any use’ (meaning presumably besides this emergency use). He also admits that the drug is the subject of multiple ongoing clinical trials and ‘the safety and efficacy of remdesivir for the treatment of COVID-19 are not yet established’. It’s a nucleoside analogue, one of many that have been formulated over the years, and dozens have been approved for use in treating viruses, cancers, bacterial and other pathogens. Nucleoside (and nucleotide) analogues are designed to resemble naturally occurring molecules used to build the RNA and DNA so essential to our biology. Some of the best-known nucleosides are cytidine, thymidine, uridine, guanosine, adenosine and inosine. The difference between a nucleoside and a nucleotide is that nucleosides are nucleobases linked to a sugar molecule while nucleotides are linked to phosphate groups (oxygen and phosphorus).
Canto: And the key is that in creating an analogue which functions differently from the real thing, they’re trying to obstruct the replication of the pathogen that takes up this analogue, right?
Jacinta: Yes, you’re getting it. Remdesivir actually has several modifications to the nucleoside structure while still functioning as an analogue – that’s to say it still manages to trick the virus into utilising it, and so becoming dysfunctional in terms of replication. A professor of chemistry and biochemistry, Katherine Seley-Radtke, describes the process in relatively simple terms:
Remdesivir works when the enzyme replicating the genetic material for a new generation of viruses accidentally grabs this nucleoside analogue rather than the natural molecule and incorporates it into the growing RNA strand. Doing this essentially blocks the rest of the RNA from being replicated; this in turn prevents the virus from multiplying.
She writes that remdesivir is a three-times-modified version of the adenosine molecule. Firstly, it’s a ‘prodrug’, in that it has to be modified in the body before it becomes active. The active form has three phosphate groups and is then recognised by the RNA polymerase enzyme of the virus. The second modification is a carbon-nitrogen group attached to the sugar, which is the key to terminating the RNA strand’s production. The third modification is a little change to the molecule’s chemical bond, replacing one nitrogen with a carbon, which prevents one of the enzymes of the virus from recognising and excising ‘foreign’ nucleosides. Remdesivir’s modified adenoside remains in the RNA chain, ultimately terminating further production. Got all that?
Canto: I refuse to confirm or deny. But I can read too. There’s a proper clinical trial of the drug being conducted in the USA at present, and other trials elsewhere. Preliminary results show faster recovery in a statistically significant number of patients, but it isn’t a cure, and will likely be part of a cocktail of treatments as other and hopefully even better antivirals are formulated. This follows the approach to treating other dangerous viruses such as hepatitis C and HIV. It’s about getting the death rate, and the badly-affected rate, down. This is as important as a vaccine, at present.
Jacinta: And I’ve heard it’s quite a tricky drug to manufacture, so getting supplies up and sharing expertise globally will be key factors in saving lives.
References
https://theconversation.com/remdesivir-explained-what-makes-this-drug-work-against-viruses-137751
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