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Or they can wait until after their baby is born and give them nirsevimab, a monoclonal antibody that was approved by the FDA in July, which also provides passive immunity ahead of RSV season.

Both result in passive immunity to the baby, providing protection during a time that babies are most susceptible to severe RSV disease.

“He’s shown himself willing to, in my opinion, bend the facts, particularly in matters like the power of passive immunity, allowing natural infection to be a substitute for vaccination.”

REGEN-COV may be able to provide immediate passive immunity to those at high risk of infection, in contrast to active vaccines that take weeks to provide protection, the company said.

Dr. Charles Chiu, a professor of infectious diseases at the University of California–San Francisco, pointed Salon to three specific ones: passive immunity, neutralizing antibody immunity, and active immunity.