Yes, prior variants stayed in upper airway. This one affects the upper lungs and hangs on for a couple weeks. All the variants are highly virulent so everyone is infected, even if on maintenance dose zinc ionophore therapy. Those with non-compromised natural immunity won’t have symptoms, or only minor symptoms.
Some people are also taking Colostrum in addition to zinc ionophores and vitamins to support immune https://my.clevelandclinic.org/health/body/22434-colostrum.
https://my.clevelandclinic.org/health/body/22434-colostrum