background : development of new natural agents for parasitic diseases treatment has unexpec­tedly increased to overcome effectively against emergence and re-emergence of parasitic diseases, the appearance of drug resistant organisms and toxic side effects of current agents. the aim of the study was to evaluate antiprotozoal activities of chitosan biomolecule on trophozoites of trichomo­nas gall...

Emerging infectious diseases, most of which are considered zoonotic in origin, continue to exact a significant toll on society. The origins of major human infectious diseases are reviewed and the factors underlying disease emergence explored. Anthropogenic changes, largely in land use and agriculture, are implicated in the apparent increased frequency of emergence and re-emergence of zoonoses i...