2.2. Selection and Exclusion Criteria
The screening focused essentially on the title and then on the abstract
of the articles. All retrieved articles written in English (reporting
primary data), with accessible full text, dealing with the presence of
free-living amoebae in swimming pools and human recreation waters were
selected. Studies whose data were insufficient, unclear or duplicated
were excluded. Case studies that do not report the prevalence of FLA in
swimming pools and human recreation waters were also excluded.