Pfizer and BioNTech are claiming that their recently developed vaccine was very effective to treat covid-19 patients. The results are beyond their expectations. The vaccine will be first tested in United States to generate data. This is great news for the whole world.
Actually seems like these pharmaceutical companies are trying to grand stand as in this Development the whole world is eyeing and if who's vaccine is accepted then they will hold that name for world record.
Russia and China is also claiming that their vaccine is Better but since pfizer is from US(that's what i know) for sure they wanted to take the credit for this.