I live in China. Walmart is by far the most hygienic grocery store here. Everybody attacks Walmart for its size and for running small players out of business. But you know what that economy of scale allows it to do? Have a completely cold chain for its meat supply. No other grocery chain (both indigenous ones and other international chains like Carrefour) in China can do that because the costs for them would be too expensive and they would lose money.
So Walmart significantly raises the bar for meat safety in a country of 1.3 billion.