A simple query can be just a
word or a phrase. An advance query may include the following Boolean operators:
"AND", "AND NOT", "OR",
and "NEAR". For more information, please read the Hints section at the bottom of the page.
PLEASE NOTE:
The operator "NOT" has to be used together with the operator
"AND" (type: "AND NOT" without the double
quotes).
Choose your
search scope:
Entire DPDx WebSite
Description of Parasitic Diseases (Parasites and Health)
Comparative Morphology Tables
Diagnostic Procedures
Image Library
Monthly Case Studies
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Hints:
You can add
parentheses to nest
expressions within a query. The expressions in parentheses are evaluated before the rest
of the query.
Use double quotes (") to
indicate that a Boolean or NEAR operator keyword should be ignored in
your query. For example, "falciparum and schizont" will match pages
with that exact phrase, not pages that match the Boolean expression. (In addition to being
an operator, the word and is a noise word in English.)
The NEAR
operator is similar to the AND operator in that NEAR
returns a match if both words being searched for are in the same page. However, the NEAR
operator differs from AND because the rank assigned by NEAR
depends on the proximity of words. That is, the rank of a page with the searched-for words
closer together is higher than or equal to the rank of a page where the words are farther
apart. If the searched-for words are more than 50 words apart, they are not considered
near enough, and the page is assigned a rank of zero.
The NOT
operator can be used only after an AND operator in content queries; it
can be used only to exclude pages that match a previous content restriction. For property
value queries, the NOT operator can be used apart from the AND
operator.
The AND
operator has a higher precedence than OR. For example, the first three
queries are equal, but the fourth is not:a AND b OR c
c OR a AND b
c OR (a AND b)
(c OR a) AND b
