The whooping cough bacteria that has super strength.
So strong in fact, doctors said a new strain may make the vaccine ineffective.
Several studies are currently focusing on the whooping cough vaccine and it’s immunity over time.
Now a letter from concerned doctors has been published in the New England Journal of Medicine.
Doctors said until a new vaccine, or new guidelines are developed, everyone should make sure they are up to date on the immunization, no matter their age.