so, under worms, it says
"Capillaria
Signs and illness development
Signs of Capillaria are difficult to detect since this is a chronic type of infection. Some birds may, therefore, fail to show the obvious signs. However, you can analyze non-specific signs such as:
- Weight loss
- Intermittent diarrhea
- Reduced appetite
- Pale combs as a result of anaemia ...
Treatment, prevention, and control
Capillaria is a disease with multiple drug resistance and there treating it can be quite challenging. A veterinarian can however recommend the use of Ivermectin, Mebendazole, and Fenbendazole for therapy purposes.
To control the development and spread of Capillaria, it’s important to keep your chicken’s bedding dry. Don’t forget to change them frequently since these worms need a humid environment to lay eggs.
Heterakis
Signs and illness development
The eggs of Heterakis worms can remain viable for several months in the right environment. This means that it may take time for symptoms to fully develop. Clinical symptoms of Heterakis include:
- Wasting
- Depression
- Diarrhoea
Diagnosis
If you have egg-laying eggs, you will notice a significant drop in the production of eggs. ...To prevent and control the spread of Heterakis worms, your birds’ beddings should always remain dry. Additionally, make it a habit to change them frequently. "
and so on. So they do not say will kill the bird. Indeed, they say that you might not notice anything's wrong with the bird. Non-specific signs are those that might be caused by a variety of different conditions, not specifically worms. They talk about drug resistance as a problem. They talk about bedding as a source of infection.
So this source doesn't actually support your contention that "THey'll still waste away as the parasite gets all the nourishment from the food they eat.
Its a slow death"