Final answer:
True, giardiasis can cause symptoms including vomiting, diarrhoea, and weight loss, but can also be asymptomatic.
Step-by-step explanation:
Giardiasis, caused by the Giardia lamblia parasite, can lead to a variety of symptoms such as vomiting, diarrhoea, and weight loss, but it can also be asymptomatic. In those with symptoms, these may include watery diarrhoea, loss of appetite, and weight loss, along with stomach cramps, bloating, increased gas, and fatigue. The infection typically gets resolved within a few weeks, but chronic cases may persist and require treatment, especially for immunocompromised patients where the illness can be severe.