Rivevos Ephraim Chelek 5:11 writes that in defer Halichos V'Hanahagos(Rav Eliyashiv) was makpid to cover drinks.He brings a story were he covered his drink when he left the room for a second even with someone else there.He also brings a story which happened on Purim where he left room then came back and said don't drink the wine because it was left uncovered .see it inside.
sam
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