What is the Infective Form of Entamoeba Histolytica and Giardia

Question

What is the infective form of Entamoeba histolytica and Giardia intestinalis?
A) cysts
B) trophozoites
C) merozoites
D) sporozoites

Accepted Answer

The infective form of Entamoeba histolytica and Giardia intestinalis is the cyst stage. This stage is resistant to environmental conditions and can survive outside the host for prolonged periods, making it a crucial component in the transmission of these parasites. Trophozoites are the active form of both parasites but are not infective. Merozoites are a type of stage found in some other protozoan parasites, such as Plasmodium, which causes malaria. Sporozoites are also found in some parasitic protozoa, such as Plasmodium and Toxoplasma, but they are not the infective stage in either Entamoeba histolytica or Giardia intestinalis.