May 23 (Reuters) - Biotron Ltd BIT.AX :
* Advise that two compounds from its library have shown positive activity against zika virus
* Says several compounds were sent to an independent USA facility for screening against the virus
* "One compound showed activity in the first round of screening"
* Says in a subsequent round of screening, a second compound has also shown to inhibit replication of zika virus
* Says additional testing is in progress
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