Health issues likewise led to a drop in bond yields to levels not seen since February.The decreases can be associated to the delta stress thats spreading quickly across the world, Cramer stated.”Maybe you think this is a technicality, but so numerous Americans dont trust the vaccines and the absence of FDA approval sure does not assist,” Cramer stated.”If we get the COVID variants under control by forcing individuals to get immunized, I think bond yields and the stock market will begin rising once again,” Cramer stated.