as a part of a major ecological study of hanna wetland, semirum region, isfahan province, parasitic infestation of 3 native and one introduced fish species were investigated. a total of 120 fish specimens were collected by both cast net and a series of gillnets between fall and winter 2007, and spring and summer 2008. some of the observed parasites are reported for the first time as new host re...

Helminth infection provides a unique challenge to the host immune system. Not only are helminths complex multicellular organisms, but they have intricate life cycles with multiple developmental stages, several of which may coexist in the infected host. In most cases, the host response to helminth infection is characterized by eosinophilia, increased serum immunoglobulin (Ig) E and IgG4, and mas...