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Some countries were indeed able to quash type 2 outbreaks with the monovalent vaccine.

They found that the monovalent vaccine increased their ability to produce mucosal antibodies against most of the tested variants, whereas the bivalent vaccine didn't provide a significant boost.

Tan, chief policy and partnerships officer at Immunize.org, told Salon he thinks it's difficult to make a definitive statement that the bivalent boosters weren't as effective as the monovalent ones.

It has found that monovalent vaccines against Omicron perform somewhat better than those that include the ancestral strain.

Likewise, FDA spokeswoman Abby Capobianco said that such claims tying the discontinuation of the monovalent shots to safety “are entirely false and without basis in fact.”