SAN FRANCISCO (MarketWatch) — Tekmira Pharmaceuticals Corp. shares rallied in the extended session Tuesday after the Centers for Disease Control and Prevention confirmed the first case of the Ebola virus on U.S. soil.

Tekmira US:TKMR CA:TKM jumped 27% to $26.82 on very heavy volume following a report of the first known U.S. case of the Ebola virus.

Shares of the Canadian drug maker rallied back in August as the Food and Drug Administration began easing barriers for the use of its Ebola treatment, TKM-Ebola.

The drug is being developed by Tekmira and the U.S. Department of Defense’s Medical Countermeasure Systems BioDefense Therapeutics Joint Product Management Office and is in early-stage clinical trials.

It just wasn’t just Tekmira rallying on the news. Other biotechs developing treatments or vaccines for Ebola were surging in the extended session.

Shares of Angie’s List Inc. ANGI, -2.45% jumped 24% to $7.90 on moderate volume following a Financial Times report that the online consumer review site was exploring strategic options, including a possible sale.

Yahoo Inc. US:YHOO fell 0.5% to $40.55 on moderate volume after the company disclosed in a Securities and Exchange Commission filing that it received net proceeds of $9.4 billion from the Alibaba initial public offering.

American Science & Engineering Inc. US:ASEI dropped 7.1% to $51.45 on moderate volume after being halted at the closing bell. The maker of X-ray-inspection systems said it was trimming its workforce by 10% to reduce expenses in a volatile global environment.

Synacor Inc. SYNC, +1.51% rose 7.3% to $2.05 on light volume after the company said it was laying off 20% of its workforce, or 70 jobs, and forecast third-quarter revenue of $25 million to $26 million.

Shares of D.R. Horton Inc. DHI, -0.85% declined 0.2% to $20.47 on moderate volume after the home builder announced that Chief Executive Donald Tomnitz was retiring effective Oct. 1, and that the company’s chief operating officer, David Auld, would succeed him as CEO.

Red Hat Inc. US:RHT rose 0.8% to $56.60 on moderate volume after the Linux-software company said it was offering $700 million in convertible senior notes due in 2019, and use $400 million of the proceeds to buy back stock.