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Wait till pandemic is over, moderna n pfizer will get hit with lot of law suits for side effects. Glad merck didn't fall for this trap.
Rna virus mutates n there are lot of varients , so vaccine may not be effective. Instead mrk is concentrating drug which slows growth of covid n its promising.
https://www.dailymail.co.uk/health/article-9184479/Merck-ends-development-two-potential-COVID-19-vaccines.html
So getting the Wuhan is safer and more effective than getting the experimental biologic agent. Who would have ever believed that?