Instruct: Identify the main category of Medrxiv papers based on the titles
Query: A Single Dose of COVID-19 mRNA Vaccine Induces Airway Immunity in COVID-19 Convalescent Patients
36
The categories of this paper are: economics
63
The categories of this paper are: pain
22
The categories of this paper are: clinical
28
The categories of this paper are: nutrition
43
The categories of this paper are: environmental
70
The categories of this paper are: otolaryngology
51
The categories of this paper are: education
38
The categories of this paper are: hiv
45
The categories of this paper are: pharmacology
40
The categories of this paper are: geriatric
4
The categories of this paper are: reproductive
12
The categories of this paper are: genomic
69
The categories of this paper are: palliative
30
The categories of this paper are: radiology
67
The categories of this paper are: transplantation
56
The categories of this paper are: research