microorganisms which engage with the intestinal mucosa performing crucial bioactivities for the
host and play critical functions in human health. Disruption of the gut microbiota from its normal
balance, as well as its interaction with the host's immune system, can influence host susceptibility
to infection and thus determining the consequence of infections by intestinal microbial
agents. Diversity of gut microbiota is linked with several metabolic and immunological conditions,
which makes it of great public health concern. Protozoa can exert a negative impact on gut
microbial ecosystem balance due to niche competition or by influencing the local innate immune
response. Helminths, however, can have a positive impact by expanding bacterial populations
that produce short-chain fatty acids and thus enhancing host's health status. This review highlights
interaction between some intestinal parasites and diversity of gut microbiota ecosystem