• Saturday, Oct 24, 2020
  • Last Update : 11:54 pm

The race for a Covid-19 vaccine heats up

  • Published at 03:05 pm October 17th, 2020
Sputnik-V Covid-19 vaccine
File photo: A nurse prepares Russia's ‘Sputnik-V’ vaccine against the Covid-19 for inoculation in a post-registration trials stage at a clinic, in Moscow on September 17, 2020 Reuters

The WHO has identified 42 ‘candidate vaccines’ at the stage of clinical trials, ten of them are at the most advanced ‘phase 3’ stage

Dozens of companies, from biotech start-ups to Big Pharma, are racing to develop a safe and effective Covid-19 vaccine, because the world needs it and for the potential pay day.

Here's an update on the quest for a magic bullet against the coronavirus that has already killed more than a million people worldwide.

How many in the pipeline?

The World Health Organization (WHO) has identified 42 "candidate vaccines" at the stage of clinical trials, up from 11 in mid-June.

Ten of them are at the most advanced "phase 3" stage, in which a vaccine's effectiveness is tested on a large scale, generally tens of thousands of people across several continents.

Also read:Covid-19 treatments: Some progress, no panacea

US biotech firm Moderna, a US-German collaboration between BioNTech and Pfizer, several state-run Chinese labs, and a European project led by the University of Oxford and AstraZeneca are thought to be among the more promising. Russia has already registered two Covid-19 vaccines, even before clinical trials were completed.

US pharmaceutical giant Pfizer said on Friday it would apply for emergency authorisation in the United States for its vaccine in late November if safety data pans out.

Other clinical trials are still in phase 1 or 2, while another 156 are in pre-clinical stages of development.

What kind of vaccines?

Some methods for making a vaccine are tried-and-true, while others remain experimental.

Inactivated "classic" vaccines use a virus germ that has been killed while others use a weakened or "attenuated" strain that is virulent enough to provoke antibodies but not to cause disease.

So-called "sub-unit" vaccines contain a fragment of the pathogen that it is derived from to produce an appropriate immune response.

"Viral vector" varieties use other forms of live virus to deliver DNA into human cells, triggering an immune response.

A measles virus modified with a coronavirus protein, for example, can be deployed against Covid-19.

There are also experimental gene-based vaccines using DNA or RNA fragments.

What are the results?

To date, only the result of phase 1 and 2 trials have been published in peer-reviewed medical journals.

On Friday, preliminary results showing that a vaccine developed by Chinese firm Sinopharm provoked an immune response were published in The Lancet.

Similar studies in recent weeks have reported on one of the Russian vaccines, along with those from the University of Oxford, Chinese company CanSino, and Moderna.

While encouraging, it is too soon to say whether these vaccines will pan out. Trials of two candidate vaccines -- made by Johnson & Johnson and Eli Lilly --- were "paused" recently over safety concerns.

But that is not necessarily bad news, said Stephen Evans, a professor of pharmacoepidemiology at the London School of Hygiene and Tropical Medicine.

Recent cases in which recovered Covid-19 patients were infected a second time with a new strain also raise the question of how long vaccines might last.

Speed vs safety

Companies backed by their governments in China, Russia and the United States are racing to be the first across the finish line.

In early August Russian President Vladimir Putin declared victory, announcing the roll-out of the Sputnik V vaccine before phase 3 trials had begun. 

But there were few takers outside of Russia, and experts dismissed the announcement as premature.

Donald Trump has promised a vaccine before the November 3 election, but it is unlikely he will be able to deliver. 

Earlier this month, the US Food and Drug Administration (FDA) said it would need to see two months of follow up data after vaccination before giving emergency authorization for use.  

And on Friday, Pfizer said its vaccine wouldn't be ready until mid-November.

But even that pressing need cannot overcome the rules.

blogger sharing button blogger
buffer sharing button buffer
diaspora sharing button diaspora
digg sharing button digg
douban sharing button douban
email sharing button email
evernote sharing button evernote
flipboard sharing button flipboard
pocket sharing button getpocket
github sharing button github
gmail sharing button gmail
googlebookmarks sharing button googlebookmarks
hackernews sharing button hackernews
instapaper sharing button instapaper
line sharing button line
linkedin sharing button linkedin
livejournal sharing button livejournal
mailru sharing button mailru
medium sharing button medium
meneame sharing button meneame
messenger sharing button messenger
odnoklassniki sharing button odnoklassniki
pinterest sharing button pinterest
print sharing button print
qzone sharing button qzone
reddit sharing button reddit
refind sharing button refind
renren sharing button renren
skype sharing button skype
snapchat sharing button snapchat
surfingbird sharing button surfingbird
telegram sharing button telegram
tumblr sharing button tumblr
twitter sharing button twitter
vk sharing button vk
wechat sharing button wechat
weibo sharing button weibo
whatsapp sharing button whatsapp
wordpress sharing button wordpress
xing sharing button xing
yahoomail sharing button yahoomail