How is Giardiasis primarily transmitted?

Giardiasis is primarily transmitted through contaminated water sources. The parasite Giardia intestinalis, which causes this infection, is commonly found in water sources that have been contaminated with the feces of infected individuals or animals. This can include lakes, rivers, or poorly treated municipal water supplies. When individuals consume this contaminated water, they can become infected with the parasite.

The other options highlight modes of transmission that are not typically associated with Giardiasis. For instance, while raw meat can be a source of other pathogens, Giardia is specifically linked to water sources. Insect bites are relevant for diseases like malaria or Zika but not for Giardiasis. Direct skin contact does not play a significant role in the transmission of this particular parasite either, as Giardiasis is an intestinal infection primarily linked to ingestion of contaminated water.