Apparently they've got capsule on them and they're also hemolytic (beta-hemolytic). Due to the capsule, the colonies are so sticky that I've got trouble with making slide smear from its single colony.
The Gram stain of the "unknown contamination":
Sticky colony, clogging cells.
Looks like these Bacillus-like cells indeed have got capsules on their cells.
Strangly, the thick capsule somehow can't be seen on some of them.
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