U.S. drug maker Pfizer said on Thursday it should know by the end of October whether a COVID-19 vaccine it is developing is successful, and will submit it for approval immediately if that is the case.

Pfizer has enrolled 23,000 patients in vaccine tests as of Wednesday. its Chief Executive Albert Bourla said in an online briefing sponsored by drug industry group International Federation of Pharmaceuticals Manufacturers & Association.

Bourla also said that political pressure would not interfere in the company's approval of the vaccine.

"We will never ourselves submit for authorisation or approval any vaccine before we feel that it is safe and effective," he explained.

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