Everybody rich and poor the whole population have parasites. It is not restricted to lower classes at all. Pets are great carriers of parasites. Also, vegetables may carry parasitic organisms. She was on a 400 to 500 calorie diet and starving to death.
Most people are upset at the thought of having worms.
She started a bottle of special supplements I gave her, but nothing happened. So, she went to her family doctor who took a stool culture, but could not find anything. Remember, this is a once-off treatment. You only need to repeat it as required. No expensive ongoing courses.