A physician with Doctors Without Borders who returned to New York City after treating Ebola victims in West Africa has tested positive for the virus, the New York Times said on Thursday.
As of 0150 GMT, the main TAIEX index fell 54.33 points to 8,676.74, after closing down 0.2 percent on Thursday.
Taiwan's key electronics subindex was down 0.3 percent, while the financials subindex was off 0.5 percent.
The Taiwan dollar was up T$0.008 at T$30.397 to the US dollar.