Harriers breathed a sigh of relief when creative midfield dynamo Melligan returned to the pitch after two minutes of treatment on a leg injury.
The home side survived a couple of early scares to put the first effort on goal 12 minutes into the match.
Tenacious play from skipper Flynn presented Shilton with the ball on the left and the wide man curled a cross-shot just wide of Barrett's left-hand post.
But Orient took the lead on 19 minutes with a goal made to look simple by the visitors' striker Ibehre.
He received a Tate long throw, easily held off marker Ayres and turned to plant a firm shot into Brock's net from 10 yards for his second goal of the season.
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