Just weeks ago, cities and even states across the United States were busy banning straws, limiting takeout containers and mandating shoppers bring reusable bags or pay a small fee as the movement to eliminate single-use plastics took hold in mainstream America.In a matter of days, hard-won bans to reduce the use of plastics — and particularly plastic shopping sacks — across the United States have come under fire amid worries about the virus clinging to reusable bags, cups and straws.