"Avian flu" AND transmission OR infection
1.6 million results
In this example, the parenthesis was omitted. We are seeking out articles with the full term "avian flu," however the order of operations views the AND as a single unit, and the OR as an add on.
Here is a visual breakdown of the search:
- "Avian flu"+ transmissions
"Avian flu" AND (transmission OR infection)
In this example, we are looking for articles that contain the full term "avian flu." We want articles containing the full term to also include either the word transmission or infection. The articles may contain both the terms, but will have at least one of them in reference to "avian flu".
Here is a visual breakdown of the searches occurring simultaneously:
- "Avian flu"+ transmission
- "Avian flu"+ infection
- "Avian flu"+ transmission+ infection