Which passage from the article best supports the opinion that Nguyen Thi Yen will keep working hard to stop the spread of dengue?
All of Yen's mosquitoes have been infected with a special kind of bacteria. It's called Wolbachia.
Scientist Nguyen Thi Yen rolls up her sleeves. Then, she slips her arms into a box covered by netting.
[Yen] had dengue many years ago. Now, she wants to save others.
The Australians contacted Yen, who works in Vietnam.