| Giardia lamblia may be implicated in chronic, watery stools but isn't usually a cause of acute illness. |
| For instance, the diplomonad Giardia is an anaerobic parasite found in contaminated water that causes the gastrointestinal disease giardiasis. |
| Furthermore, during encystation, Giardia must secrete cyst wall proteins, which are cross-linked by disulfide bonds and are needed for survival in the external environment. |
| Microfiltration employs the largest pore size, and can remove sand, silt, clay, algae, bacteria, Giardia, and Cryptosporidium. |
| Giardia organisms form a resistant cyst that is shed by the host in its waste. |
| Giardia and Cryptosporidium were the most common etiological agents, followed by bacteria and viruses. |
