TABLE 2.

Search lines used for the literature research of aMPV serological studies in wild birds present in PubMed, Scopus, CAB Direct and Web of Science databases

Database	Search line	No. of studies retrieved
PubMed	((((“pneumovirus”[Title/Abstract]) OR “avian pneumovirus”[Title/Abstract]) OR “avian metapneumovirus”[Title/Abstract])) AND ((((((((Antibodies, Viral[MeSH Terms]) OR *antibody*[Title/Abstract]) OR *serolog*[Title/Abstract]) OR prevalence*[Title/Abstract]) OR Study*[Title/Abstract]) OR Survey*[Title/Abstract]) OR Survey[MeSH Terms])) AND (“animals, wild”[MeSH Terms] OR wild bird*[MeSH Terms] OR (wild[Title/Abstract] AND bird*[Title/Abstract]))	16
Scopus	TITLE‐ABS(“avian metapneumovirus”) OR TITLE‐ABS(“pneumovirus”) OR TITLE‐ABS(“avian pneumovirus”) AND (TITLE‐ABS(“wild”) AND TITLE‐ABS(*bird*)) OR TITLE‐ABS (*wild AND bird*) AND (TITLE‐ABS (*sero*) OR TITLE‐ABS (*survey*) OR TITLE‐ABS (* antibod*))	14
CAB Direct	(title:(Avian Pneumovirus) OR ab:(Avian Pneumovirus) OR up:(Avian Pneumovirus) OR id:(Avian Pneumovirus) OR cabicode:(Avian Pneumovirus) OR (title:(Avian metapneumovirus) OR ab:(Avian metapneumovirus) OR up:(Avian metapneumovirus) OR id:(Avian metapneumovirus) OR cabicode:(Avian metapneumovirus)) AND (title:(sero*) OR ab:(sero*) OR up:(sero*) OR id:(sero*) OR cabicode:(sero*) OR title:(prevalence) OR ab:(prevalence) OR up:(prevalence) OR id:(prevalence) OR cabicode:(prevalence)) AND (title:(wild bird*) OR ab:(wild bird*) OR up:(wild bird*) OR id:(wild bird*) OR cabicode:(wild bird*))	11
Web of Science	ALL = ((“avian metapneumovirus” OR “avian pneumovirus” OR “pneumovirus”) AND (((wild) OR (free‐living)) AND (bird*)) AND (antibod* OR sero* OR survey*))	14

Note: Boolean operators ‘OR’ and ‘AND’ were applied. Number of scientific contributions retrieved before duplicate removal is reported.