CSL (ASX:CSL) signed a multi-year agreement with the Pan American Health Organization to boost preparedness for potential influenza pandemics in Latin America and the Caribbean, according to a Wednesday statement.

Under the deal, CSL Seqirus has reserved "millions" of vaccine doses that participating countries across the region can order if an influenza pandemic is declared, the company said.

CSL Seqirus will collaborate with Argentine production partner Sinergium Biotech to ensure rapid manufacturing and delivery of the vaccines if required.

CSL shares advanced 1% in recent Wednesday trade.