The present invention relates to variant AAV capsid polypeptides, wherein the variant AAV capsid polypeptides exhibit increased transduction and/or tropism in human pancreatic tissue or human islets as compared non-variant parent capsid polypeptides.

Provided are a pharmaceutical composition for resisting infection with SARS-COV-2 or a mutant thereof, and a combined drug thereof. To solve the problem of the lack of effective prevention and treatment drugs for infection with SARS-COV-2 or a mutant virus thereof, provided are a recombinant protein vaccine and/or an adenovirus vaccine for preventing and/or treating an infection with SARS-COV-2 or a mutant thereof, and in particular, provided are a nasal spray administration compound formulation containing active ingredients of two vaccines, i.e., a recombinant protein vaccine and an adenovirus vaccine, and a combination of the two vaccines for nasal spray administration, which can induce generation of strong antibody and cellular immune responses in vivo and block the binding of a protein S of SARS-COV-2 to an ACE2 receptor of a host cell, thus enabling a host to resist coronavirus infection. Particularly, the present invention has good prevention and treatment effects on various mutant viruses.