Epidemiological Terms

Mark Rigby rigby at eco.umnw.ethz.ch
Tue Aug 26 05:09:41 EST 1997


Dear Roberto:

	The term prevalence (or, the percentage of infected individuals in a
population) is the proper term to use.  It is defined thus:

(number of infections/number of individuals examined)*100

Abundance, however, is a term that you may have heard but is of limited
use in respect to microparasites becuase it is defined as:

(number of parasites/total number of individuals examined)

or, mean intensity x prevalence.

This term is of limited use when you cannot determine the number of
parasites in a host, as is common in microparasites.

	These, and other terms, can be found in Schmidt and Roberts (1989),
Foundations of Parasitology; the original publication   Margolis et al.
(1982), The use of ecological terms in parasitology. J. Parasitol. 68:
131-133; and in an upcomming volume of J. Parasitol.
-- 
____________________________________
Mark Rigby
ETH-Zurich
Experimental Ecology
ETH-Zentrum NW
CH-8092 Zurich
Switzerland
tel:   +41-1-633 6035
fax:   +41-1-632 1271
email:  rigby at eco.umnw.ethz.ch
____________________________________



More information about the Parasite mailing list