CSL Ltd., an Australian maker of blood-plasma therapeutics, says it is exploring whether it can develop a plasma product to treat Ebola.

Chief Executive Paul Perreault said he formed a small team to assess the feasibility at the request of the Bill & Melinda Gates Foundation a few weeks ago. He called it a “highly unusual” request, but said CSL responded right away. CSL wasn’t previously exploring an Ebola treatment.

The...