Chang also conducted clinical trials in a remote part of Brazil, the results of which confirmed that those who used anti-IgE did not develop compromised immunity, nor did they become easily susceptible to parasites.
張子文也在巴西偏遠地區做過臨床試驗，結果證明使用 Anti-IgE 者沒有免疫力低落、易感染寄生蟲之虞。