By Carolina Mandl (Reuters) – Wall Street’s main indexes ended Monday roughly down on fears that China could resume stricter measures to fight COVID-19 after it said it faces its most severe test of the pandemic. Beijing said on Monday it would shut businesses and schools in hard-hit districts and tighten rules for entering the city, as infections ticked higher. “There is this fear that China might reinstitute some of the COVID restrictions that they’ve just purportedly started to lift,” said Carol Schleif, deputy chief investment officer at BMO Family Office. U.S. casino operators with busine…