...
if only based on claims, the vaccine has not been approved...
Just as the news of this epidemic is said to be just a 'fraud', and maybe as well as likely unilateral claims made by many drug companies, their main goal is only to increase the value of shares. I welcome this news but also remain skeptical.
If they were announcing that their vaccine was effective when it wasn't, it wouldn't be long until we figured it out and the stock price would be absolutely decimated for the fact that they were dishonest about it, so there's absolutely no upside to lying. No drug company is going to risk saying they have an effective vaccine when they don't.