Covid cases have risen sharply in nearly every country that has launched a mass vaccination campaign.(Please watch this short video before You Tube removes it)

Why is this happening?

Mass vaccination was supposed to reduce the threat of Covid but– in the short-term– it appears to make it much worse. Why? And why is Covid now "surging in 4 of 5 the most vaccinated countries"? According to Forbes magazine:

"Countries with the world's highest vaccination rates—including four of the top five most vaccinated—are fighting to contain coronavirus outbreaks that are, on a per-capita basis, higher than the surge devastating India, a trend that has experts questioning the efficacy of some vaccines … and the wisdom of easing restrictions even with most of the population vaccinated." (Covid Surges…Here's why the US should Worry", Forbes)

Worse than India? How can that be? And why have 8 "fully vaccinated" members of the New York Yankees tested positive for Covid?