COVID really was a MUCOSAL compartment disease & Clancy tells it as it is, COVID is a mucosal disease & it becomes systemic via the GI tract! You get immunity to a respiratory infection because you

are swallowing the virus or bacteria that are recognized by immune areas/cells in the GI tract, and the cells in the GI tract then directed to the lungs where an immune response is generated (Clancy)

The immune response begins in the GI tract immune areas (conducting airways, before it gets to the systemic immune response that then releases pro-inflammatory cytokines)…Dr. John Campbell is astonishing also, and he came a long way and is fully on our train, a brilliant scientist!